I'd look for a 2 box solution, even if your not going for a full blown separates setup. If your DVD player is integrated into the processor, and the mechanical transport wears out, or the laser fails (lasers get dimmer the more you use it and eventually fail... although they can last many years) then you've gotta replace the entire thing. With a kit which doesnt include the DVD player, then if something goes wrong, or even if you decided to upgrade to HDDVD/BluRay later the sound system is still usefull.
To be honest, its better to make space on a shelf somewhere for the kit, rather than comprimise a combined dvd/processor combination. But the choices is yours at the end of the day.