Chrixx, you are in the classic "want/need" self -abuse arena!
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I applaud our choice of Denon, but there are also other fine choices in receivers out there (Onkyo, HK, Yamaha).
If you stick with Denon the 3805 would be an excellent choice and will drive your outfit with ease. If you want to save a few $$$, the 1905, 2105 0r 2805 would also be excellent choices. What you really need to do is to compare the features (
do that here ), decide what you want the unit to do for you, overlay what you want to spend and make a choice. If you have the opportunity, get out and do a little auditioning as well.
The other things that need to be considered are bragging rights, testosterone and your comfort level of "what if...". Finally, the most important ingredient of all, completely obviating anything else I have listed is - what will your wife allow you to have?
On a serious note, the 1905 is all you would "need". The 3805 is about all you could "want". It's really a matter of features. I originally had an 1803 (roughly equivalent to a 1905) driving a M60/VP100/QS8 configuration and a 20-39 PCi sub. It was PLENTY of receiver. A year later, for no good reason other than I wanted it, I upgraded to a 3803.
Let us know what you decide.