Novice budget audiophile seeks advice on Heresy II

Thanks in advance for taking the time to lend me a hand. I am an entry-level audiophile on a fairly tight budget. I just purchased a pair of Klipsch Heresy II speakers, and would appreciate some advice on them.

Here is my system:
NAD Int. Amp. C320BEE
Marantz CD5003
Pioneer graphic equalizer SG 9500
Klipsch Heresy II speakers.

Here's my question. I like the sound of the speakers, but I think I am hearing a little mud in them. Is there anything that can be done about this? For example, would it help to have the crossovers recapped? If so, can anyone recommend a place to send them? Or, for another example, I've read that adding a subwoofer makes the Heresy IIs play more clearly. Does anyone recommend this? If so, could you recommend a subwoofer that matches my system?

Thanks again for taking the time to answer.
Before recapping anything you should lose the graphic equalizer, play with speaker placement and consider upgading your cables.

Recapping everything is completely out of control. Sure, there may be better caps available than what originally came in your Heresys, but there is no guarantee they will have a positive affect on your speakers. Usually after equipment gets modified it shows up for sale. There is a reason for this.
Check with Bob Crites, the guy made my Klipsch KLF 30's go from mid fi sound to some of the best speakers Ive owned at any price.

I'm not familiar with what mods are best for the Heresy II's, Bob should know. You won't be sorry for any upgrade through him. he knows his stuff and has a good ear for his tweaks
Bob Crites is the man. A recapping might be in order but first experiment with placement, toe-in etc. I did a rebuild on my crossovers and replaced the stock tweeters with a pair of CT-125's on my original Heresy's and they really came alive, huge audible difference. I will next do the crossovers on my HII's when I get a chance.