bi-amped means seperate amps providing power to the tweeter and woofer.
My thought -- keep it simple here and don't worry, for the time being, about biwiring, biamplification, etc. This will provide a minor, incremental improvement to your system's sound and is better (imho) to consider these tweaks later, after you're used to your system's sound, rather than now.
Instead, I'd focus on choosing speakers that you like the sound of and that are within your budget (assuming you're planning on replacing speakers) ---- personally, I like my b&w speakers a lot, had my main pair since'86 so I'm a bit biased. I'd recommend hitting a few nice stereo stores with some tunes you like and listening to what they have to offer. You should be able to get a sense of what you like and don't like pretty quickly
The 3000 es is a great amp and will serve you well -- not sure what kinda tv you're running, but my suggestion is not to worry 'bout running video through the 3000 es, instead, only use it for audio. Also, you'd want to feed your cd/dvd player into the 3000es digitally and not use the analog connections (the 3000es converts all incoming analog signals to digital, so feeding a dvd to the 3000es via analog inputs has it going d>a>d>a.
In a nutshell, I'd shoot for buying a player that can play cdr disks, dvd disks (dvd-a if you're interested too, ditto sacd) that can be digitally connected to the 3000es (all should offer this). Your vcr's audio output would plug into the 3000 es too, ditto the audio out from the ps2. If you can't plug the video outs from all of these into your tv, they can all plug into the 3000es too and the 3000es can feed video to your tv.
The 3000es will work great as an amp for up to 7 speakers (front mains, center, rear side and rear back surround pairs), you should have no NEED for any additional equipment once you settle on a dvd player and speakers