I've known Glen Seekins for a long time. I've used many of the AR10 products he produced for high end builds. His bolt action designs are excellent, well thought out and well designed. The actions I've used for custom builds are favorites due to quality and pricing.
I had the privilege of working with Bergara when they first entered the U.S. They were having the same growing pains as every other arms company at the beginning. They have figured most of the stumbling blocks out and are fully capable of producing a fine product.
Just a couple of observations though for making decisions:
'sub-MOA' is one of those slippery terms often applied to accuracy claims which is far too general to be meaningful. We, as buyers and shooters, have had 'sub-MOA' accuracy even in factory rifles for 40 or more years. To me, it's meaningless to even make the statement without excellent clarification. Look at the non-custom rifles which actually produce .5 MOA accuracy consistently. The price point may vary though.
These days, carbon wrapped barrels are all too common and there are no guidelines for critical comparison. We all assume (yes I know about using this term) that all barrels using carbon fiber wrapping technology are significantly lighter and potentially more accurate. This is simply not true. The visual appearance of carbon fiber used in any application is a draw for most folks. If it appears to be carbon fiber, it has to be better. Find out how the barrel is made and what the carbon fiber actually contributes to the quality and accuracy of the rifle. Some use CF as window dressing to capture the attention of the under informed.
'Custom builds' can be misleading in these days of factory assembly line parts for rifles. There is a growing number of kitchen table, basement and garage wannabees who want so badly to think of themselves as a gunsmith while avoiding the quality, cost and time frame of a true custom gunsmith. Descriptions can be and often are misleading in many of the Classified Ad forums across the internet. When considering a custom build, be sure to know who built it and what their reputation for quality is before offering up your hard earned income.
Enjoy the process!