Wide receiver is definitely a strength for your team. Roddy White and Hakeem Nicks both could end up as top 5 wideouts, and Percy Harvin has significant upside going in to his third NFL season.
I have to agree that you are a bit weak at your RB slot after the top two. Darren Sproles and Danny Woodhead both should play a scatback role for their respective offenses and catch passes, but the problem with players like that tends to be consistency. Depending on how the workloads split up on the Patriots and Saints, Percy Harvin might be a better flex play all year.
I'm not too bullish on Todd Heap, but I can see where you are coming from. Heap has proved himself as a reliable safety valve in the NFL throughout his career, and in the limited time we've seen Kevin Kolb play it seems that he likes to target TE's.
You should be competitive in 2011, good luck