hi guys, im kind of blur dunno should i get a Xbox 360 or PS3 .. im the GTA fan, play almost all GTA

Well to begin with, GTA V performs better on the PS3.
Plus with a PS3, you will have extra processing power.
Other than that, PSN is also officially supported in this country while XBL is not.

recent went to few game shop and ask about the price, both not very much difference. now what i have in my mind is, Xbox 360 (modded) cause i can play alot of non ori game or download, i know it's sounds so bad but because i couldn't afford a game which cost me so much of money    (low salary and high living cost) and i dont think i will be able to play daily due to very long working hours.

I can't answer this as LYN does not allow forumers to discuss about piracy or modded console.
But as you will not be able to play games daily because of working hours, just get a PS3 and buy original games that you will really enjoy playing.

Things i concern about the Xbox 360 is ring of death, alots of people told me that xbox 360 very easy get overheated and once it overheat, cost of repair also not cheap, it is true? it is also happen to the lasted version of xbox 360?what are the common issue of xbox 360?

Common issues are of course RRoD and overheating.
And according to Kotaku, some older models of Xbox 360 (2006-2008) have issues when playing GTA V.

http://kotaku.com/users-of-older-xbox-360s...shes-1366187910

PS3 i read about lot's review, very reliable and so far not many problem i heard from the users but blue ray game seriously i cant afford it , sorry to say that..... I hope someone can give me suggestion ..

Yes, PS3 is more reliable, but at the end of the day, it will also depend on your luck. You may bought a defective unit, who knows right ?