Keep in mind that I have not used Martin's worksheets to actually produce anything (just to check some things I already have...so take this with a grain of salt)
When I run the TL you have with the Dayton RS270 ($63.50 at PE) and .2lbs/cuft stuffing I get:
about 10db down at 23-24hz
4db down at 30 hz
Flat from 40hz to 80hz
There is a suckout above this but since you aim to use it as a sub...no problem right
When I run the TL you have with the Peerless 850146 ($69.96 at PE) and slightly more stuffing (circa .25lb/cuft) I get ver similar results. flat between 80 and 40 with a slightly earlier but shallower roll off.
about 10db down at 22hz
4db down at 30hz
1db down at 40hz
When I run the TL you have with the Seas 25F-EW ($65.80 at Madisound) and similar stuffing I see
about 10db down at 24hz
5db down at 30hz
about 3db down at 40hz
I stuffed all of these lightly because you suggested use as a sub (I.e suckouts above 80hz wouldn be a problem) and you expressed a need for efficiency. All of these drivers seem to "work" in your TL, with the seas probably the least successful.
Tests performed at
http://206.13.113.199/ncdiyaudio/mark/Testing/Woofer3/10 inch woofer test.htm
tend to suggest good performance for the Dayton.
The peerless has a much larger xmax spec than the Seas (9mm to 4mm) with the dayton in the middle at 6.6. How accurate these numbers are is probably debatable.
Sean