find out how much head the pump puts out, that means how much water it could pump straight up, i think
but alomost everyone uses these pumps (not me though, getting my via 1300 today

)you'll be fine. if you dont want to butcher you case, did you think of mounting the HC on the outside?
goto amdforums.com and watercooling section and look through the case gallery, get some idea, there is one person that has everything mounted on the outside behind the case, he just made like a little shelf for the pump,
cant find the link, but its there somewhere, he has a copper cylinder res, if anyone know where those pics are on amdMB post it in here
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Asus A7V266, AMD1600xp
1x 256ddr 2100 Crucial
radeon 8500 64mb, Ati TV-Wonder PCI
Maxtor Diamond Max Plus 9 7200rpm ata133 & 60 MAXTOR ata100@5400rpm

6xdvd, TDK dvd+RW
SoundBlaster 5.1 w/ logitech Xtrusio DSR100 speakers
Case: Enlight 7237