90 mile round trip work commute
90 miles is roughly 140km, so if you're riding that every day it's about 700km a week. Which puts you in elite rider territory for upright bikes without power assist.

It's doable, it's just going to be hard and you'll need to work on nutrition and health as well as fitness. Note that there's also a balance here - if you use world class equipment to get a bit more speed, but need extra recovery and dress/undress time, you might not gain anything. So it might be better (as well as a lot cheaper) to go with elite level gear. I've assumed you'll do that below. You could drop further down that scale, but you will start to lose overall and also the sheer time involved will mean you can only sleep, ride, work (you're already looking at riding 4 hours a day, working 8, sleeping 8, eating 1... that's 3 hours for everything else in your life).

If you're just going to buy a standard elite road bike ($5,000+ and riding kit $1,000+), I suggest joining your local club and buying whatever their favourite bike shop recommends. It will probably help to have two bikes so you can get your weekly service done without having to panic about whether your LBS can get it done in time. Especially initially, you're probably going to need to ride alternate days, and you'll benefit greatly from going on your club training rides once a week or so rather than commuting every day. That way you get training tips and someone to help you understand how your bike works and how to get best use out of it.

One option is to buy a power assisted bike. You'll need to look really hard at battery life, and if you can get a second charger and leave that at work it'll be much easier. I'd also buy two batteries, because 90 miles a day is going to hammer the battery. From your use of imperial units I'm going to guess you're in the USA, which means power limits are hard to predict (they vary haphazardly around the US). 

Note that most ebikes and kits are designed to boost low speeds only, and in Europe you can't boost high speeds at all (assist has to cut out at 30kph). So you'll need to shop specifically for kits that will boost you at 20-30mph. Those exist, I've seen a couple of triathalon bikes set up with 500W front hub motors that could cruise at 70kph/45mph for an hour... but those were "money no object" demonstration units at a world solar challenge.

A recumbent is the obvious way to deal with some of the problems. If you choose a fast lowracer or highracer style bike and use bright lights to compensate for the lower profile you will get better comfort and similar speed, assuming your ride is relatively flat. The big win really is comfort - you won't be fighting saddle sores anywhere near as much as on an upright, and you won't be as sore after the ride.

 

The lowracer style (on the left) is slightly faster in a time trial, slightly slower in a slalom, but you're in a time trial. The main reason to buy a high racer is wheels - they typically use 700c wheels so you can use the wheelset off your existing bike, or buy them easily anywhere. 406 wheels for lowracers are typically harder to find and there's not the intense market contest to get you really nice wheels are a reasonable price.

Combining those two will require a little more work, but a recumbent will probably take a power assist kit better than the road bikes you're looking at. IMO this is the way to go, as you get a small, light, fast bike at a reasonable price (under $10,000). If you did put a kit into your front wheel it would be relatively easy to swap in and out, so you'd only have the wiring and battery mount in place when you wanted to leave it at home.



The no-compromises approach would be a velomobile, possibly with power assist. The Trisled Avatar is designed to go 50kph/30mph using 200W from the rider. Other velomobiles give similar numbers, especially if you pay extra for the fast versions. If you're fit enough to consider riding 90 miles a day, every day you should be able to exceed that fairly easily. That would cut your commute time without compromising your body the way staying in a time trial tuck for 90 minutes would. I believe someone in the USA is doing a 30 mile each way commute in an Avatar. (full disclosure: the Trisled factory owner is a friend of mine).

Trisled don't support electric assist, but there are other fast velomobiles that do. The eWAW is one, but their focus is on helping with stop-start riding so you'd have to talk to them about getting better top speed on long rides. The Avatar is about $15,000 in the USA, the eWAW starts at about 7,000 Euro(google docs link, in Dutch)  but I think the electric version is 8,500 Euro.