on these two links from the 4-core CPU AMD Phenom X4 9850 or two core CPU AMD ATHLON-64 X2 6000 + all depends on your goals ... + Update the BIOS ... cooler and this will suffice.

I wanted to know if I can use one of these new processors from his cooler, will it fit? The question may not be here, but all the same: what distinguishes sAM2 from sAM2 +?

I looked processors and decided to stop at these 3:

AMD Athlon 64 X2 6000 + (Windsor) 2 x 3000 MHz
AMD Athlon 64 X2 7850 + (Kuma) 2 x 2800 MHz
AMD Phenom X3 8650 (Toliman) 3 x 2300 MHz

Which to choose? And please give an answer about my cooler!

AMD Athlon 64 X2 7850 + (Kuma) 2 x 2800 MHz -? And who can say that the AMD Athlon 64 X2 7750? Excuse me for wedging in the topic, now that I also like the choice of options.

nothing more than to look at, but the opportunities have less than the AM2 socket with a plus, as more new processors in the old socket not work. pro cooler, your more than enough.

CPU AMD ATHLON-64 X2 6000 + this is quite enough, and the price is acceptable only in your task that executes your PC.? and not known, may be preferable 4-core, CPU AMD Phenom X4 9850 to 125 watts, both ... And it in some applications, the film re-encode or photoshop work, besides some multithreading in modern games is already available!

I want to change my current memory for faster, for example:
2x1024Mb PC6400 Corsair XMS2 [TWIN2X2048-6400] or
2x1024Mb PC6400 Kingmax or
2x1024Mb PC6400 Corsair 4-4-4-12 XMS2 with DHX Technology [TWIN2X2048-6400C4DHX

What advise?

savings, the difference from the use of these modules will not notice ... you have 4 giga 6400 and a standard without overclocking.What you have now is worth?