Can I replace the motherboard in a Gateway E-4000 mini tower?

I have an old Gateway (Model # MFATXPNT ESX E4000) which I'd like to upgrade several components starting with the motherboard.
Anyway, I would like to replace the existing motherboard with an ATX or mATX, but I'm having difficulty determining if those form factors will be compatible with the case. I think the existing MB is an mATX because there are only 4 exp. slots, but how can I be sure?

I'm considering the following parts:
Motherboard: M5A78L-M LX PLUS Socket AM3+ 760G mATX
http://www.asus.com/us/Motherboards/M5A78LM_LX_PLUS/#specifications

CPU: AMD FX 4130 Black Edition 3.8GHz
http://www.microcenter.com/product/408700/FX_4130_Black_Edition_38GHz_Quad-Core_Socket_AM3_Boxed_Processor

Memory: Kingston 4GB DDR3-1600 (PC3-12800)
http://www.microcenter.com/product/332847/4GB_DDR3-1600_%28PC3-12800%29_CL9_Dual_Channel_Desktop_Memory_Kit_%28Two_2GB_Memory_Modules%29

Hard Drive: Seagate Barracuda 2TB 7,200 RPM SATA 6.0Gb/s 3.5" Internal Hard Drive STBD2000101
http://www.microcenter.com/product/383892/Barracuda_2TB_7,200_RPM_SATA_60Gb-s_35_Internal_Hard_Drive_STBD2000101

Any help would be greatly appreciated!
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  1. I'd be wary. I've done similar kinds of upgrades, and it's always a pain trying to work around the original hardware. For instance, getting all the unmarked I/O plugs to play with a new mobo can be a pain. With your level of upgrading, I'd spend a couple more bucks on a case and psu and boom, you've gotta a new build (minus the OS). You could get the rest of the parts you need for probably like $80 if you shop around and steal the optical drive from your old machine.

    Just my two cents. Good luck!
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