Budget floorstanders under $500 ?

Hey everyone,

I'm trying to find a pair of budget speakers with decent low-end. My current set-up is Cambridge Audio DVD89> Jolida 102B> Mission M71i. The Missions are small bookshelf speakers with a 5" woofer and spec down to 65hz (I think) buth they're really thin on even the mid-bass. I have a small 11x10 room. I listen to 50s/60s jazz, female vocals and rock. I'm considering a few speakers from Audio Advisor - Energy C-300s, Boston CS226s or Athena LS300s. I'm also considering the Polk M20s or Monitor 50s which are selling very inexpensively on NewEgg.com.

Can anyone provide suggestions or alternatives?

Thanks in advance for your help,
Tim