Thanks for posting this question. It's one I've wanted to ask for some time.
I've got nothing but square-taper compatible cranks on my bikes and really am happy with all of them.
The Paul's crank won't work for you, as it is only available for single-speed or fixed-gear applications. It's heavy, really pretty, and really well built. Here's their Web site, just for fun: http://www.paulcomp.com/rdcrank.html
The Middleburn RS 7 is really pretty, stiff, but a bit heavy. It is a very versatile crank, but isn't available with 172.5 mm arms and was designed with off-road intentions: http://www.middleburn.co.uk/cranks_rs8_&_rs7.php
The White Industries crank is a really great idea. It's stiff and has a whole ton of options available for rings; however, they are propietary. It's a bit hefty for the project you're intending, but I've been pretty pleased with mine: http://whiteind.com/cranks/roadcranks.html
Finally, the Specialites TA cranks are ones to consider. I've got the Carmina, and am really happy with it. You can change out the spiders and there are rings available for it in virtually every size. It's probably the stiffest of the bunch and the lightest of the ones mentioned here (not in the same category as the Stork). http://www.specialites-ta.com/gb/manivelle-vortex.html
I've tried the Tune BigFoot and was pretty disappointed - it wasn't very stiff, creaked like an arthritic's knees, and didn't seem very reliable.
Stronglight also makes a square-taper crank (not available in black, as the others are).
Like others have said, the best of the bunch is probably the early generation Dura Ace. That was probably the best crank I'll ever use.
Thanks again for posing this question. I'm excited to hear your thoughts about moving to SRAM with the Phil Wood bottom bracket.