i'll give you some food for thought.
a) first i'd stick away from anything other than 144BCD, chances of borrowing a 151 or 130 at the track from a buddy is generally remote. over time you'll generally end up with 47, 48, 49, 50, 51 and possibly 52. in the meantime being able to borrow rings to try different gears is pretty handy. i see a lot of riders get real frustrated cause they buy a bike that has 48/15 and they race this for everything they do (86"). nothing worse than having to crank at 150+ rpm just to keep with the bunch.again as you buy rings, spend the bit extra and get nice ones.
b) you can partially mix and match 3/32 and 1/8 in some circumstances. for example you can run a 1/8 chain on a 3/32 chain ring. but generally you want to run a complete matched drive train. personally i find 1/8 stuff easier to source.
c) there is not a lot of technology in track cranks. you see guys buying a really nice set of cranks and then swapping them frame to frame to frame over a number of years. so my view if you are just starting out. either buy really low end, while you just see if track riding is for you, or if you feel you are uber committed buy high end. the standard that i'd compare everything else to is DA. you can get 7600 at PBK for just over $200AU (as a plus you can get nice track BB's for these with loose bearings and no seals as opposed to cartridge). if you buy DA you'll usually get most of your cash back on eBay if you decide it's not for you.
d) i'm currently running a set of FSA carbon pro track cranks. at the time i got gifted them. to date they have been fine, they don't have the same stiffness as DA, but then again i'm not chris hoy and dont put out 2,000W so it's hardly an issue. i do wonder about the longevity of the pedal thread inserts given the number of stannding starts i do in training.
as it turns out i'm replacing them, not through any fault in them, but i'm building a new bike that is a full carbon frame and will have a hand done air brush finish on it. i'm going to get DA, have the annodizing removed, then finished in black chrome. so basically the FSA aren't bling enough ;-p
e) the omniums get decent reviews in terms of stiffness. i'm not particularly bothered by a wider Q factor, but obviously some people are. if that extra 10mm of so is going to bug you, maybe these aren't the best choice. i'd think many serious pursuiters would not have them as their first choice.