I think Brent at Brenspeed is good! So I think you'd be in good hands! The only thing I can say is that I KNOW Ken is good, really good! He is the go to guy for many racers, for STC themselfs!, 5.0, etc!!!
Also for when your tunes get more involved... you'd have a guy that have done and seen most with Ken, again, I don't know Brent but think hes 'up there'.... It's just a recommendation, I know Ken and can stand by his tunes, I know him personally and have seen stuff I can't even begin to explain...
I think BS (lol) is much larger than MD too so you'll prolly have a harder time to deal with them, I know Ken is on the phone 'all day' helping customers...
Read the CAI test in the latest 5.0, or one of many other articles where 5.0, MMFF, etc. turned to Ken for tunes. Or call Eric (Master Tuner AT STC) and ask him what he knows about Ken... also ask about Brent, I'm sure he's know and great too! :winks