GA-78LMT-S2P is value series mobo and here you only get the features you have paid for - no extra frills and the components used here are good enough for the price.
The main diff between rev 3.1 and 4.0 is cpu support - the rev 4.0 mobo supports cpus mostly with 95W TDP only and rev 3.1 mobos can support cpus with 125W TDP - which means rev 3.1 mobos has better cpu compatibility as this the value based segment I will recommend only to use cpus with 95W TDP on this mobo.
GA-880-GM-USB3 is a bit high end mobo and has more features at extra cost like USB 3.0 - better onboard IGP and couple of some more extra features - if you need those features like esata/usb3.0 then it's great mobo.
Going with GA-770T-USB3 (rev. 1.3) is not recommended as this does not supports AM3+ cpus and are you really going to use all those pci-e x1 and pci slot on that ATX mobo.
So the mobo buying decision greatly depends upon on what features you need, what cpu you will use and if you have any plan for OCing the cpu..
if you are happy with features of GA-78LMT-S2P and will use only a 95W TDP cpu then this is a great mobo - you will be even able to OC the cpu.
IF you want to have more features and want to use ( and OC ) a 125W TDP cpu then GA-880-GM-USB3 ( rev 3.1 ) should be your choice