Thats a sweet receiver and I wouldnt say its going all out as im sure 5,000+ on a receiever in my eyes is going all out....
However, I think if you got a top of the line Onkyo 806 or higher you would be extremely pleased, future proofed, and have spent alot less.
you want it to decode all HD audio, and if your going to future proof make sure its THX certified ... thats the only thing mine isnt ... as I got a lower end Onkyo 605 but to get my start into HT at like only $280 was awesome as they sell for $400 or so on amazon.
ecost.com is a certified refurb onkyo dealer ... you can get great bargin there if you want to get a receiver much cheaper than retail and have the extra cash to say buy your sub already for the price of you getting a denon (which very good) at say the price Rick got his.
ecost.com also sales denons ...
whatever you choose, I definitely recommend ecost.com on your receiver cause even if you didnt like it you could return it and may only cost ya $40 or so to do so ... since I believe there is a retrun shippnig charge on something so big, nto for sure tho...
cosmetically the receivers are brand new even tho refurbished ... they are typically receivers that had a malfunction or didnt work that got returned and then sent to ecost.com or tigerdirect as liquidated where the certified techs fix the issue and then they sale them alot cheaper and you can also buy warranties and such for them if that makes you feel safer about your buy.
anyways ..... Here is what you need to do in my eyes, from being a guy who was like you and jsut got into HT ... I learned alot from say said mistakes I shoulda done.
1) Get a receiver that is as much future proofed as can be ... by being able to decode all the HD audio you want to hear, THX, sufficient amount of HDMI inputs/outputs in the back of it ... easy plug ins in the back etc. Try to get the best deal on the receiver to save money for the front speakers
2) Buy the best front speakers your money allows as they will put out most of your sound , make sure they are a color that you like and would go well in rooms of the future ... i.e. black as opposed to maple or red cherry (unless you really like that look ) black is typically cheaper too. Obviously you want something cosmetically nice esp if the wife has any say so in the matter. If I had my way with speakers at the moment ... I personally would get some high end Polks maybe Klipsch ... If I wanted to really be happy and impressed with my fronts for a very long time id budget say $1500 for the pair ... (IMO)
3) Center Channel ... another key ingrediant to your overall sound as this can alot to any movie being watched ... get a bad ass center channel of the same brand as your fronts and if able "timbre" matched ... timbre in the sense that every time a company makes speakers they make sets in the sense that these were made to compliment the others ... although its not necessity as you may never hear the difference but real audioholics eat that **** up.
4) rears ... here is where you can be a little more conservative and they are alot cheaper if you get bookshelf speakers as your rears which many do ... they are also smaller , not floorstanding (which your front towers should be) and are easy to aftermarket if you ever upgrade ... but ofcourse there are kick ass bookshelf rears as well that would make you never wanna upgrade.
5) Sub, all depends how big of a bang you want , smoothness and how much ur willing to spend ... I'm not big on sub right now as I dont care to have it overcloud the movie plus im in an apartment, I'll have a better word on that when im building my HT in my house ... hopefully within the next 2 years
if your in no rush ... buy the receiver, buy some fronts, move the bose to the back as your rears until they are bought or use no rears until those are bought ... your bose may be wireless with no speaker connections anyways, dont know.
In any case, receiver, fronts, the rest can be bought peiece by piece to give you complete sound ....
also, for a bigger room you can do 7.1 as opposed to 5.1 .... i.e. 5 speakers and the sub counts as the .1 or 7 with 2 middles on top of your fronts and rears and center channel.