The good thing about tuners is that they can be purchased used for fairly cheap. If you buy your receiver and find it's FM is not sufficient, you can go on ebay or audiogon and find a separate with little problem.
As for your DVD player, I'd like to add to what Rip said: "Sonic fidelity is a given at nearly every price" if you're using the digital out. That's because you're using your receivers DACs. If you use the player's DACs (analog out), a higher price will probably bring you higher fidelity. Consider the Denon, Yamaha, and Marantz universal players. BTW, if you're not going to have surround sound, don't worry about the SACD. 2-channel SACD is not an (significant) upgrade from CD in 2-channel.
A center channel is totally up to you. If you'll be watching many movies, buy one (but also think about adding surrounds further down the road for SACD and movies). If not, don't worry about it. If you buy one, try to get one that is timbre matched to your mains (or, move the acoustic energy speakers to the rear and buy 2 new mains and a new center).
If features and the most advanced video processing aren't huge concerns for you, I'd recommend NAD receivers. Otherwise, I'd recommend the Yamaha over the Denon 2805. Many seem to feel that there's a large step up from the 2805 to the 3805, but many also feel that the 2500 compares well to the 3805.
Go to the stores, see, feel, and use anything you may buy. ESPECIALLY SPEAKERS. The quality of audio you can expect lies within the quality of speaker you buy. Go listen for yourself and pick what you like.