I got the ubiquitous Bulletproof cranks on my main ride. Alloy, reasonable light, built beefy so they handle tons of abuse (hey, they're BMX), not too expensive. It limits me to 110bcd stuff but as long as you're not specing out high-end track rings you can get generic rings that will fit just fine. If you get a set of track cranks you may get suckered into one of the track-specific spider spacings which will make it more difficult finding rings at all, nevermind cheaply.

My other ride features a Sakae road crank, 130 bcd, also works fine. Both are 170mm and it's alright but I do maybe wish for a 165.