Proper PCB grounding with several general purpose ICs
Wow,  Well we could spend hours discussing ground.
I'm not that much of an expert, but I have made lots of mistakes.
First I would say there are two "ways" to think about ground.
At low frequencies (DC to audio) the "star" ground concept is useful.
Here I'll draw a picture, with big heavy lines for paths with a lot of 
current.  And then bring all those separate paths to one point.
(the point where power enters the circuit.)

The idea is to keep the high current's out of the more sensitive parts of the circuit.

At higher frequencies ~10 MHz and above, one starts thinking about a ground plane
that is everywhere.  With lots of ground connections between the case and the 
ground plane.  At the higher frequencies on is not so much worried about the DC drop in the ground lines, but the inductance of the ground.  You want the fast signal wires to have a (continuous) ground plane underneath them that carries the return current. 

I'm sorry I haven't answered your question.  Whether you have a loop or not depends on how you lay it out.  And a small ground loop on a pcb may not be that bad.
The best thing is to build it and try it, and remember that you may have to "fix" the ground.