I find it terribly amusing someone that spent $200+ on a Killer NIC is attacking another person for buying 8GB of ram because it's "money wasted." Since you're not using it all the time... seriously wow.
As for me, I'm running 8GB of ram because:
1. 8GB of DDR2 800 at 4-4-4-12 costs less than $200
2. iTunes alone regularly can use upwards of 2GB
3. I commonly have over 50 tabs spread across 5+ instances of IE running (using upwards of 250MB of ram)
4. Vista 64bit is already shown to be a memory hog, and I don't want to run at 95% physical memory usage constantly.
Furthermore: If my motherboard supported 16GB of ram, I'd be buying that!
As for me, I'm running 8GB of ram because:
1. 8GB of DDR2 800 at 4-4-4-12 costs less than $200
2. iTunes alone regularly can use upwards of 2GB
3. I commonly have over 50 tabs spread across 5+ instances of IE running (using upwards of 250MB of ram)
4. Vista 64bit is already shown to be a memory hog, and I don't want to run at 95% physical memory usage constantly.
Furthermore: If my motherboard supported 16GB of ram, I'd be buying that!