Best thermal paste for 3200 + Winchester? [heatsink fan] [thermal paste]

Q: I just played my parts for my computer, I have my CPU and heatsink / fan that comes with it. I just need to know the best thermal paste to apply. Any suggestions? Im new at this, VAT .

OK, time to decide, CPU / MB / RAM for Gaming Great Stable / encoding system? [heatsink fan] [ok time]

Q: OK, think time to reorder. When I started this process I was thinking of getting the DFI LP Mb and a x2 4400. But after seeing all this stuff Opteron im not sure. I want 4400×2 performance (in this range) and im not talking about something as cool water, exotic cooling, etc. Just do it like maybe some OC do with the normal heatsink / fan. Want it stable and not have problems.

Im going to use it for gaming (BF2, Fear, especially FPS games type) and DVD / video encoding etc.
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Please Re: my system. Where are the weaknesses? What must now be upgraded? [master dp5] [heatsink fan]

Q: Last weekend I upgraded My mobo, CPU and case / power supply. Take a look at my system, because it is now configured and give me some advice. What are the weak link? What parts should I look at the next upgrade? What priority?

My applications are mostly business applications, photo editting, web surfing and burning CDs. I rarely play games. (Okay, The Sims is an occasional abuse.;))

AMD Duron 600MHz @ 900MHz
Cooler Master DP5-6H11 Heatsink/Fan
Abit mobo

Heatsink / fan, what kind of connection? [thermal pad] [heatsink fan]

Q: Is it necessary to use thermal compound or grease or a thermal pad when attaching a heatsink / fan on a socket A 800 TBIRD?

I have none of that, just wondering if it is needed or if its just something extra?