Upgrade , looking to 5 box.

Hello all. been reading these for awhile. Bought my keyclone , got 3 accounts 4 counting wifes.

I am wanting to 5 box 1 machine. Would like to know of the upgrades i need.

Operating System: Windows XP Home Edition (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_gdr.070227-2254)
Language: English (Regional Setting: English)
System Manufacturer: MSI
System Model: MS-7325
BIOS: Default System BIOS
Processor: AMD Athlon(tm) 64 X2 Dual Core Processor 5200+, MMX, 3DNow (2 CPUs), ~2.6GHz
Memory: 2048MB RAM

Sry . was useing vista but had a mb problem (kept bluescreening. , and black screen with just cursor.) so went back to XP.

Useing 7600gs nvidia cards. SLI . thou its not running sli atm. guess from the XP install.

Sry cant be more clear. decent HD i over 200 i think.

i can run 3 accounts now with abit of lag here and there. And i can run 4 with abit more lag. medium settings.

Also i have another comp i built , yes i tried it. ( got this one from ibuypower.) anyway its in a green dragon case. something is wrong with it , it runs extremly slow and it wipes all my internet connections. , might be possible to just put new MB , proc, hd ,ram in it then. It was duel core amd also.

I rather use one system. Its what i did in EQ , and to me alot more simple. I am also lookin at a 22inc lcd.( wife gave me the ok lol ) well she said i could get the 26inc hdmi one but then no new Vid card. So if i go that route would running a 22" is it possible to duel mont with a smaller one ? gonna give wife my 19 viewsonic and i gonna take her 17" till i get the green comp going.

anyway this is a awsome site , thx for any info. sry i couldnt be alittle more clear. used to know more but after 7 yrs gaming and all i worried about was faster ram and v-card think i dummed down alot haha.