Strongbow

Just got back into the sport and need to get myself a high end AEG again.
I'm mainly looking to buy parts from Blackblitz and having a gun doc here install the parts here in Calgary. but the real question is where to begin. I've already picked myself the RHop'd Prometheus tight bore, and the SHS piston, but no more than that as of yet. So, what other parts should I seek from blackblitz in terms of reliability/accuracy? I'm going for more of a DMR build, so high ROF is not a necessity (I'll be shooting semi/3 round burst 99.9% of the time).
Also wheres a good place to get my hands on a decent MOSFET?
*note that I'll be trying to get a majority of my parts from one retailer, as dealing with many at a time is too much of a hassle*
*edit: Also looking into siege tech gears as I've heard plenty of nice things about them, but I'm not sure if they're worth the investment as I'm not going for a high speed high stress build. Any insight into this would be much appreciated