krell ksa100 vs. audio research 150.2

wgallupe, something else a better choise? poss less money. same best of best results. poss diamond in the ruff?
thanks for the response bryon

the pre amp is a nad 1600. im not sure what you mean by upgrade path? my budget is 800-1500$. i would like to have a much better stage and instrument clarety, i would like a little more base w/o a powered sub if i can help it. i also have a oppo cd player i use.
the sourse was a cd player from a burned cd off of the ethernet. and he was using definitive tech speakers the ones for 1k each.
i tried using the marantz with the oppo it was a little better and a little louder, but nothing that would make me sit down and liten to my collection again. that is what i am looking for and a amp that i can say o.k. i dont have to worry about that piece being the weak link, when upgrading.
thanks for your opinions bryon

am i going to get the same sound( articulation and power) from a kav300r as a ksa100 or a kst 100. why is the ksa and kst so much heavier and i assume hotter?
to anyone and thanks to everynone

thanks digepix, so the ar is better than both the ksa and the kst?
thanks bryon