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Since you listed three brands which don't go well together lets start there.In choosing ram one can opt for high latency plug and play ram(that's what crucial is and the value versions of mushkin and corsair);low latency ram for very aggressive timings and great performance at stock speeds or for very fast ram to overclock your FSB to a higher level with...you've got to decide what you want to do

.If you're overclocking it's harder to do with dual channel ram and the larger the size of the sticks the harder it is to do too,so I think you're really going for either the jeep or the rolls and not the 10 second car.The advantage of that gig of ram over a half gig is that your hard drives page file will never(hopefully) take the place of your ram,the disadvantage is that its hard to soup up that gig.Crucial does not really give one a lot of suppot at their web page nor if you email them with specific questions,so you should use either the equally good mushkin or almost as good kingston.
Likewise don't be seduced by all the 9800 hype,almost all games can still be played well on the much cheaper radeon 9600 pro selling for half the price of the 9800.The geforce cards are inferior to the radeons;but have much better drivers=they're more plug and play cards,rather like crucial ram.This makes no difference to hardware enthusiasts;but might make a big difference to you.
The same goes for power supply units
😱ne only needs 400w+ if one has an overloaded rig(tons of hard drives,extra fans and optical drives);one needs the extra juice to overclock with or one is buying for upgrade head room-360w is all you need for that rig.Fortron source is the preferred PSU here,both for quality and price;but check out silverstone,enermax,vantec and antec too.