ron-
what from a quick glance at the posts no one has mentioned is to ask for an in home demo of one or more of the components your looking at. hifi honey is also right about dealers, any dealer who not discussing at least 25% or more off of msrp is trying to take you for a ride. treat it as you would purchasing a car, do you walk in & pay the sticker or do you negotiate?? for the quality/price of components your looking at the dealer should be willing to do a demo. if not + his fantastic deals you were offered i would shop elsewhere.
as for comparing pre-pros, it's a pain. the least awful way to do it is to set up system on a small table with easy access to the rear for switching back & forth. anthem makes a solid pre-pro, i recently sold my avm30 & purchased a cary cinema 11, after a demo of both the cary 11 & the macintosh c45. for 2 channel music, the c45 was the best, followed by the cinema 11 & then the avm30. for other functions, it depends on what your looking for, as the anthem & cary have digital processing & the c45 does not, & only the avm30 accepts any kind of video signal. the avm30 offers a myriad of setup options & has the easiest on the fly adjustments.
again i skimmed the prior posts but it looks like you purchased an avm30 & anthem amp. i have zero experience w/ anthem amps but purchased an avm30 after in home demos of rotel, cary cinema 6, krell, the denon 2805 i previously owned & there was at least one other that i now cannot recall. from experience, the best sound quality improvement you can make using an avm30 for 2 channel music is to use a player with a balanced output & use the avm30's balanced inputs.