I have the exact model, i have done extensive upgrades, i added another 80GB HDD that i had from a PS3 a while ago. i read up in TomsHardware forums that this is a perfect machine for gamers who are inexperienced in building their own rigs. basically all it needs is a CPU, PSU and graphics upgrades. That being learned, i threw in a VisionTek ATI Radeon HD 5670, a 700W PSU, and a Phenom II 555 BE 3.2Ghz CPU. i now play COD:Black Ops at max details (medium online thanks to WiFi lag).
The MoBo is capable of 800Mhz RAM and accepts up to 89W power draw from a CPU, hence the 235e Stock CPU.
so, upgrade the Graphics to your desired card, remember you cannot do SLI/Crossfire since the MoBo only has one x16 slot. There is plenty of space for even a huge Graphics card, someone put a huge one in theirs on TomsHardware.com and it works well for them. the MoBo is awesome too, its an AM2, but since all AM3 CPU's are backwards compatible to AM2/AM2+ its not a major issue. it comes with 6 gigs of RAM but goes up to 8 gigs. and i haven't even noticed a significant increase in the RAM temps.
i do however worry for the GPU, it reaches 62C which is freakin hot. Which is why i'm going to invest in a Water Cooling system soon.
If you have Facebook you can see my mods to it.
I replaced that awfully bright green LED with a dimmer red LED.
total price for upgrades and base system in the end?
ET1331G-03W MSRP = $398
AMD Phenom II 555 BE = $89.99 <from Amazon
Coolmax 700W PSU = $59.99 <from Amazon
VisionTek Radeon HD 5670 = $149.99 <from BestBuy
Total = $687.97
Doing a bit of research, putting together this computer with equal or lesser value part from Newegg (common gamer store) the results are similar but not exact in specs, i don't even know if it will work together, and yest it would be cheaper without the extra PSU and CPU, but thats what you get with the ET1331G-03W.
The price i came to with shipping is $690.98... but i tried to only get the cheapest garbage that a gamer wouldn't even look at, to mock up the stock ET1331G-03W. Then adding the price of what i upgraded. Yes, the mobo in the ET1331G-03W is worth $5 to me.
I hope this comes very helpful to many users of this Computer. Yes my review/experience is a long one, but if you read through it, then you know, its one heck of a deal. My windows Experience index is 5.9 but no one cares about the HDD rating. my CPU is 6.6, the Memory (i haven't touched) is 7.1, the Graphics are 7.0