Next step in upgrading my home theater system??

I want to make calculated steps in upgrading my HT setup and unfortunately I do have a budget As for now I have B&W DM603 fronts, s600 center and S601's for rear surround powered by a Yammy rx v2400 130w X 7 receiver with an Oppo upscaling DVD player going to a Panny projector. Eventually I want to jump into a 1080 projector (now I have 720) and Blu-Ray and also upgrade my audio. My question is do I keep my current B&W speakers and add something like a Rotel 1075 120Wx5 amp? Or is it better to upgrade my front speakers and then add power? Adding the Rotel 1075 would be a pretty easy addition but would it make a difference in sound quality? I watch a lot of concert DVD's followed by HI Def sports and then movies.

Thanks for the advice!

--JK