Don from LDS and I are going through some options for a custom build. What I'm looking for: Nice loud, efficient and flexible (in terms of me always changing tone/heads/basses/pedals,etc). Most importantly, I'm considering this as an investment, so it's hopefully the last big cab I buy for a while. Play tube heads or warm solid states (Ashdown ABM's, Genz Streamliners). Vintage P basses with flatwounds, with a nice mid thump. Option 1: Ported 610 at 5.3 ohms with 6 Beta 10a's. http://www.usspeaker.com/BETA10A-1.htm I have a 410 with these and I like it a lot. But will a 5.3 ohm 610 be able to handle most gigs, even big outdoor ones? Option 2: Sealed 810 with 8 of these: http://www.usspeaker.com/faital%20pro%2010fe200-1.htm They look like a good lightweight speaker. Also the 810 will be made with 1/2" ply, making it under 100lbs. Sounds awesome. For those who have experience playing around with cab builds, maybe can point me in the right direction?