Hello Mark,
Power-wise, I think that you would get an honest delivery of the watts number. My first Denon AVR was the 2106, with a 90 watts/ch@8ohm power rating. That little sucker could move (my then rather inefficient) Magnepans to nice musical levels. Surprisingly, their power supply was happy with the Maggies' low impedances (about 4ohm stable from factory), holding together an incredibly good 3D soundstage in stereo. PLUS for movies added the surround speakers and center at 8ohms. For a receiver (and at the bottom of the Denon AVR line-up), this 2xxx chassis did very well. So, in this sense many speakers out there should work fine with the AVR-2805.
The digital audio (and video) sections vary MUCH by generation - as well as by price point. The 2805 is behind for both reasons. So, IF your playback equipment need decoding beyond 96khz/24bit -- or any of the newer HD formats -- the AVR-2805 with not handle it via digital. However, it does have one set of RCA multichannel inputs, which may come in handy. (For example, if you have a blu-ray player, the clarity of soundtracks on movies decoded for HD DTS/Dolby can be better appreciated...as long as the player is the one decoding digital).
My AVR-2106 could not match the audio quality of the analog pre-amp section in the 3xxx, 4xxx and 5xxx series. Still, with some care, Denon's Pure Direct mode allowed its music to be quite delightful. I certainly did not feel too deprived the day an accident killed my 3805. While waiting for its replacement, I pulled the 2106 out of storage, hooked up decent interconnects plus a 14ga power cord. Which reminds me If you get the 2805, or ANY Denon (AVR or player), get them some 14ga power cords (ideally, shielded, if you can appreciate 3D imaging on a deeper/wider soundstage).
This Denon UK page still has links to discontinued AVRs: http://www.denon.co.uk/uk/product/pages/product-detail.aspx?catid=hometheatre&subid=avreceivers&productid=avr2805