Re: barebone vs. build
B69-1400 - This is actually the price you would pay for if you were to order everything separately. That's a pretty short mid-tower case, a wonderful Gigabyte MoBo (Z68 chipset with 'alright' features), a shoddy psu, some regular memory, and a 120GB SSD. The rebate is pretty much your savings here. Not bad.
B69-0520 - Again, regular memory, and a shoddy psu. This one features a stunning Phenom II processor with a wildcard micro-ATX MoBo (its stats are impressive, but no SATA III). You get a 1.5TB HDD, which, in this case, is better than the other two builds in terms of space (you can always purchase a 32GB SSD for your OS).
B69-4750 - I'll just say, if you're going for budget, and you're going to be primarily gaming, hold off on this thing. You're not going to need an 8-core processor...
You may just want to buy them all separately. The prices Tigerdirect.com gives is exceptionally close to the parts separately, with most of your savings coming from rebates (even then it's only about $130-$150 savings at most). You can get everything you want for under $800 if you're going for a Micro-ATX build, which it looks like you're doing.