When I built my kegerator I knew I wanted stainless hardware because it'll never wear out. All my shanks are stainless, all my faucets are stainless (Perlick & Intertap, all flow control), and now even my quick disconnects are stainless (~$15/each from Williams Brewing, occasionally on sale). My tubing is Bev-Seal Ultra with (plastic) push-in fittings (buy a couple extra in case one breaks.)
I prefer flare fittings to barbs for the sake of convenience in cleaning, swapping, and otherwise messing with my system. If you ever want to use a Sanke keg you can get a flared tailpiece that will work with a Sanke coupler, like this:
Or you can get a ball lock-to-Sanke adapter so you don't even need to swap out your disconnect, like this:
I've also used the flare tailpiece when one of my push-in shank fittings broke and I didn't have a spare, but did have a spare push-in flare fitting. Adaptability will set you free.
Also, I swapped out all my corny keg poppets for "universal" poppets rather than have to deal with tracking down brand-specific poppets, which is pretty nice, but I've discovered recently that a couple of my stainless disconnects need a very stiff poppet spring to provide enough back pressure to fully open the disconnect.
I use a bulkhead with a keg post for to run my gas through:
The last thing, I thought I might want to do nitro at some point, so I built in an added line for nitro. My two taps closest to the nitro line are the Intertaps so that I can swap the standard nozzle for the stout nozzle. I still haven't used it yet, but it's there, ready and waiting.
Good luck with your build!