Power supply for this config

Hi guys, im currently going to buy a new pc, with i7 2600k + asus P8Z68-V + a small SSD. That would be all to start, farther ahead im going to overclock it, take the cpu to 4.0ghz or more (5.0 max). I will add a dedicated video card gtx 570 and a hdd of 500gb. And maybe a couple of extra fans. Overclocking will take place at the end of the year (or farther ahead), or depending what i need. By that time, i can sell the psu that i got, and buy a new one.
So what i need now is a psu to holds that i7, with stock clock, and the gtx 570 which i will buy next month. Running some wattage calculators, output was 665w, so a 700w psu would be enough?

And the second doubt, is that the only psu i can get in my area are from topower, thermaltake and antec. I am not familiar with those brands, but the only one i saw at good price (at least good price here   ) was Topower Nano TOP-700WB 80+ Modular at U$S 165.00. They also have:

Topower Top-700w (without the "80+") : U$S 139.00
Topower Nano TOP-800WB 80+ Modular: U$S 186.00
Antec 750W 80+ : U$S 188.00
Thermaltake RX 750w 80+: U$S 214.00

214 is out of budget so, i was between the first 4. The doubt is, are those brands good, they deliver what it says? and if with 700w im ok for this system.

Greetings! and thanks in advance. (:

P.s: Im from Argentina, prices are from here, and my english isn't that refined. So sorry for that!