my budget is : 500, but for the price i pay i sorta expect stunning graphics with absolutely nooooo lag
$500 is a pretty miniscule budget for a gaming computer....
anyways.. I would suggest you NOT get a laptop. They heat up pretty quickly and most aren't upgradeable. Also, I don't know why, but openBVE has this weird inability to tell the graphics card to ramp up. My system with a i5 3570K @ 4.2 Ghz and a Radeon 7850 lags horribly on the R46 exterior because my graphics card remains at idle even in openBVE, which causes the game to lag as the R46 is pretty resource intensive. I've been trying to find ways to ramp up the graphics processor while playing openBVE, but so far, no luck. Since michelle has disappeared off to who knows where and openBVE has not been updated in almost a full calendar year, I don't know whether this issue will ever be fixed.
As I said before, its pretty hard to work with a small budget for someone who wants gaming performance. Here is what I can offer you for $600:
http://secure.newegg.com/WishList/PublicWishDetail.aspx?WishListNumber=17292409I couldn't include any hard drive, as it would have added too much onto the cost. You're going to have to reuse the hard drive you currently use. Another thing is that you will have to build this machine by yourself. You're going to have to do your homework, but the value of this machine far exceeds any piece of junk that Dell, HP or anyone else can offer. Custom built machines always offer better value than prebuilt ones.
The $500 systems listed above all have their own flaws. The FX 4130 is too weak to run GTA IV. The GT 610 is complete garbage and is not for gaming by any stretch of the imagination. For an extra $100, you can have a i3-3225, which is faster than the 4130, the GTX 660, which blows the GT 610 out of the water and with the rising cost of RAM these days (supply and demand), the 8GB of RAM adds on $70 to the cost of the prebuilt machines when you can get 4GB for $40 right now and hopefully when prices drop, you can get another 4GB stick to total 8GB. Last year, 4GB was only around $20 while 8GB kits were $40, unfortunately this year RAM prices have skyrocketed and I personally wouldn't pay for 8GB of RAM at this moment in time.