You may want to:
1. clean the hsf, and re-apply thermal compound
2. add fans to improve the airflow in your casing
3. do some cable management

I'm using Elite 335 too, for intake I have two 120mm fan; for exhaust I have one 120mm plus one 80mm, together with psu and graphic card exhaust. With a proper cpu cooler (killer whale) and cable management my cpu is idling at 28C, northbridge is idling at 35C but my gpu tend to be on high side idling at 67C (4870 is damn hot, and my X-Fi is blocking the back of it). My ambient temperature is 25C air-cond.

I didn't mod a top exhaust lar, it's a rear exhaust. I just replace the pci slot cover with Silverstone Aeroslot, then put a 80mm fan over it as exhaust. It could be better if I just remove the cover but I can't stand the look of it. For my second 120mm intake fan I just mount it over the free 5.25" bay using a piece of plastic board. Those are tool-less mod.

You can buy aeroslot from Modernopc, either in garage sales or their online shop (I got mine from the online shop).
Yup, that's the plastic board I'm using, but black one. You could use some rubber/silicon base to dampen the vibration/noise. Works for me.

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Added on October 21, 2009, 8:04 pmYou need cable management indeed
you could check my cable management here but that time I haven't got myself with the aeroslot yet. Still need some improvement though (after I got my motherboard back I'm gonna re-do it).
Use your creativity to add fans lar. I use the free 5.25" bay and the free pci slot backplate to mount fans.

This post has been edited by TitaniumZ: Oct 21 2009, 08:14 PM

Nice and neat Shows that you don't need a CM690 for good cable management. Proud user of Elite series