Should I reverse the air flow in my computer case?

Okay, I made my own computer, and I must say, it's really good... it has Windows XP, I have a Xion case, 750Watt PS, AMD Athlon 64 X2 4200+ Manchester processor, 2GB Corsair XMS 3500LL-PRO RAM, ASUS A8N32-SLI Deluxe Socket 939 Mobo, XFX Geforce 6800 XT (256 mb) video card, 80 GB HDD (For now... I plan on getting like a 250 SATA), DVD burner... you know, the works... Anyway, The only problem is that I shove it in this little hole in my computer desk right against the wall which causes it to overheat... So I was wondering if you think I should take it out of the desk (Which would be a pain and I'd probably start falling over it and crap...) OR if I should open my case and flip all of my fans around so that the air intake is in back and it blows the hot air out of the front. Has anyone done this? I think it'll cool off my PC a lot. My motherboard is like 113 degrees farenheit and is usually hotter than my CPU!!! Okay, enough talk... somebody help me decide what to do... No water cooling.