I would highly recommend that you opt for the DV62SI speakers. They have a better tweeter (3/4" vs 1/2") and a larger woofer, allowing for more bass response. And believe me, they have bass. You can get the DV62SIs for $124.49 a pair, shipped, from X-10.com. I would say go for the 62s as surrounds as well. The DV62CLR would be the logical center channel for these speakers and that runs $110.49 at X-10.
I would say build your system slowly as your budget allows. Try for the front 3 speakers if you can, but perhaps just the L&R speakers.