I have not heard the T1, but I do own the T2. For movies, the T2 absolutely needs a sub and I would suspect that you still want/need a sub for movies for the T1 (not needed for music, but you also get sub placement benefits that you lose with built in subs).
Why not get the GE Sat 50 or Sat 3 for the surrounds??? That would make more sense to me. In general, I think 7 channels is dubious unless you have a very large room. 5 Ch is the sweet spot.
Personally, if this were my $, I would be leaning a lot more towards a pair of the T7 and a pair of killer subs from the likes of SVS, Rythmik, HSU, or PSA.