7900GT or a x1800XT(512mb)

[shadow_chazzer_killer]

hey ppl

i have just finalized most of my things that i ll be keeping in my new rig next month..howeva i m yet to decide on which CPU n GPU..
i will first start with the GPU
i have been lookin forward to the 7900GT...but i may also consider a x1800xt which is almost the same price as the 7900GT....also PS that the 7900GT which i m considering is a XXX (or extreme edition) card clocked at 530/1630(factory OCed)....

so here wht i think...
x1800xt
+better IQ
+better performance in AA HDR n AF compared to 7900GT
+512MB of raw RAM
+high clock rates
+better overall design with HS on RAM
-runs hot
-big size
-dual slot
-cross fire can be exp then SLI
-not so easily upgradable
-not so good OCer
-noisy
-dual slot
-less pipes
-ATI drivers not so matured to nV's


7900GT
+better price-to-perfomance ratio
+runs cool
+very good OC
+some companies sell pre OCed card(ATI card dont have this)
+less noisy
+SLI more easily n cheaper upgradable then crossfire
+single slot
+better drivers
+good 1280 x .... perfomance
+good shaders
+more pipes
+need less wattage juice
+HD picture quality
-no HS on RAM
-slightly worse in AA HDR n AF
-slightly worse IQ
-weak HSF

n thats all


PS
1)I live in India here the daytime temp can reach a 45C mark in summers n sometime 47C....so sugg me a more cooler card
2)my room is not sooo dust proof...my case gets dusty in abut 5 days after cleanin it..so i want a easily cleanable card
3)i m planin to get a dual setup in something like 8 or 9 months...so which will be better SLI or CF
4)i will be also buying a dell 24"er...n play high resolution...


any advise sugg truly appreciated
personal advise also accepted or of any kind

BTW sorry for the extremly bad english

shado:thanks guys in advance