'decent' amps seem to be whatever you can afford(a decent amp for a billionaire, and a decent amp for a high school student are 2 completly different categories)
most amps these days seem to be very close to each other in quality and performance, so find one that you like the best.
for subs, the one that has recieved the best reviews has been the jl audio 13TW5. i'm told that the clarion thin subs are also decent..
what dayton model are you referring to? i was not aware that Dayton audio made any thin mount drivers at all.
tangband as a brand seems to be hit or miss-- they are all over the board on every product. some are crap, some are decent, and some are amazing.
head on over to a dedicated car audio site like diymobileaudio.com, or some of the ones listed on the sticky at the top of the page for some better info.