Newbie needs advice on video projector. Please help!

[wolfdogg]

Hi all. I went and saw a band this weekend, and behind the band was a huge backdrop with the actual videos of the cover songs they were playing. What a great idea! I play in a band.. and I don't want to copy the video background idea, but I still thought it would be great to play some HD video clips behind my band. The thing is.. I have an eight-piece band and we fill up any stage pretty good. What kind of video projector should I look at that would allow me to play videos behind us? Would an overhead projector be the best idea? What kind of aspect ratio would allow for a full stage video behind us? What kind of price range will I be looking at?

Thank you in advance for any advice.