If I got the BTL it would be a fosgate 2000 1bd and if I got the type r's either a memphis pr 1000d or a fosgate 1000 1bd. The t2000 amp is very power hungry though and the BTL route is much more costly then the type r's.
If the Type R's are going to save you lots of guap >200-300 dollars then definately go with the R's. Less to worry about electrically with the memphis 1000d.
Type R's are definitely starting to sound much more appealing. If I had the wads of cash for it I'd just go two BTLs just because no1 around my area has them and they seem to be very strong subwoofers. I don't have as much faith in the Type R's only because I've never seen them ran personally and don't know how well they perform compared to others and have heard their durability may be questionable. Now if I go with the Type R's is the Memphis amp sufficient and what would some of you recommend building the box to? How big and where should the tune be for the loudest and best sq mix I can get?