Choosing Oscilloscope with appropriate bandwidth for Jitter analysis
I'd consider investing my time and money in a phase locked loop (PLL) and VCO circuit - use a long time constant and build a very steady circuit - not hard to achieve but will save you a lot of money. Input the signal you wish to measure jitter on and look at the control signal to the VCO before it gets filtered - if there is a lot of jitter it will show up here and there is enough "information" in that signal to calculate jitter.

I hate spending lots of money on one-off equipment if at all possible - that's the motive for my answer.