Which motherboard do you have? It is quite likely you could cange the CPU for something faster without changing the moherboard as well.
The RAM is OK.
Before you start spending, do some housekeeping first. It`s surprising how much faster a system an be made to run by clearing out all the junk, updting drivers, and defragmenting the hard drive.
And a virus/malware sweep does n`t hurt either.
Why does everyone over use the term "bottleneck"? There is a bottleneck of sorts in EVERY PC. When you load a game, your CPU's L1 cache is bottlenecked by the L2 cache, which is bottlenecked by the L3 cache, which is bottlenecked by the RAM, which is bottlenecked by the hard drive. You can not get away from it.
Yes, your PC is not performing as well as it would with a faster CPU, or memory, or better chipset, or blah blah. I would suggest overclocking your CPU, its free.
do you think that my system will bottleneck if i install the 9800GTX+ instead of the 8500??
Of course it will, but you should still upgrade your video card, cause it will still rock compared to your 8500. It's not like its not going to perform well. It is just it will perform better with a faster CPU.