a little noob help for PSU

BB051405

Junior Member
Apr 13, 2013
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purpose is gaming (bought all items psu is all whats left)
need a little spoon feeding /heh

intel i5 3570 (non k)
2x 4gb of ram 1600
gigabyte ga-h77-d3h
a 2nd hand HD 7750 (going for GTX 660 Ti/HD 7970 soon)
1 SSD 128gb
1 HDD SATA 500gb
Antec 1100 (be using all fans)
CM hyper 212 evo cpu cooler

no idea about psu's and its watts or whatsoever
planning on getting a 750 watts (750 cos ive read it will be good if i get a high watts even if i dont use its full wattage. avoiding overheating or short circuit or something?) and there is something i dont know about
should i get modular (what is it? lol) +12v rails or something store sellers ask. terms i dont about as this is my 1st build. what brand and exact name would you suggest for psu?
i want it silent, neat on the inside for good airflow, good quality of course (just want my simple rig to last for 5 or more years if it can) budget is around 90-120$