new case aopen HX08, need cooling advice

Oct 9, 1999
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Im buying one of these used, I wanna mod it later on but right now Im concerned on cooling. I just ordered 2 120mm fans before I bought this case. I have a 350 w psu waiting on it but it is coming with a300w that I will replace. My main concern is fans, The guy said its coming with 4 80mm fans, 2 in the back top above the PSU to pull air out. 1 is in the middle front pulling air in and the last one is at the bottom front puling air in. Should I replace any of these fans with my 120 fans, or I was wondering if it would be a good idea to put a 120mm fan on top to help pul air out and then put the other 120mm fan on the side between my agp and cpu(around in that area) to pull air in. what do you guys think, or should I replace all the fans or what... and also what kinda blade cuts cases good when adding windows. LMK guy what you would do with this case.

My specs are:

asus a7v 266e
tbred 1700+ with volcano6(soon to be ax-7 when it comes in)
256 2100 ddr ram
gainward 4200 64mb(sold just now and getting 4400 instead)
2 20 GB hd's
cdrw
cdrom
350w psu

LMK with any ideas on fans/modding/or any ideas in general

THX!!