I realize this thread was a couple of years back, but am just placing my input here in case you are still trying to simulate slash's tone.

Firstly, try to get a les paul - solid body (No hollow-body guitars) and hopefully maple wood heh. You won't be able to buy anything grand with that budget so you may stick to Epiphones - try to get the standard. You might be able to purchase for RM 1,800 maybe? or RM 2,800 (not too sure now) - Yes you have to increase your budget.

From there, do some research on pickups. Slash uses Seymour Duncan - Pearly Gates (both neck & bridge pickups) on most of his axes. To obtain the natural drive he gets off his amp, you have to invest in at least a half-stack (30 - 50watts) on a Marshall amp and crank it up all the way up to 8 (hehe). Or else, invest in a tube-amplifier (try class A/B - slightly cheaper). Also, for the Appetite for Destruction album, he uses the Marshall Jubilee tube amplifer series - which is now no longer in production. Though they reproduced it (at a very limited amount - one off) we'll probably never see them reproducing it again.

Good luck.