I think the best way to go on an AVR budget wise is the Yamaha aventage series. I think the Yamaha RX-a720 (that's their starting model going up) has a PRE out for a separate amplifier support. I got the RX-a1000 for $500 bucks on newegg a couple of years ago. 3 years more or less. still kicking ass until now paired with my adcom 2 channel amp. I've seen $500 deals on aventage 720 and 820 on amazon or ebay I think. well, 500 bucks more I guess. money, money, money! there's always something out there. can't get enough......
start with the aventage series for your avr and get a separate amp after a couple of months or a year later. and oh, you might want to get an AVR that is network capable to read your files on you PC's harddrive. im using ps3 media server. awesome software for my flac collection.
PS3 - PS4 - Kodi HTPC - 6TB Seagate NAS
Marantz AV7702 - Emotiva XPA5 - Emotiva UPA-700
(2)Polk RTi12, CSi5, (4)RTi4, (2)MFW-15 subs, (4)polk owm3 ceiling mounted for atmos