I am looking to spend $500-600 on a new receiver and I have my eyes on a Denon AVR-2803, Onkyo TX-SR601 and Onkyo TX-SR701. Does anyone have any suggestions/recommendations? Thanks. I have a pretty basic system right now with Infinity front left and right speakers and Aiwa center, surrounds and sub. I am also looking to upgrade in the near future and need a versatile receiver that currently would utilize an apartment-sized living room and in the future a house-sized living room. I like that the Onkyo 701 is THX, though I don't have alot of experience. Is that a strong buy point?