I wanna install OS X Leopard on my PC. But I'm new to everything that has to do with pirate apple things. So I need some help from you guys

My specs:

GFX: ASUS EAH4870 Series (DDR5, 1gb)
PWRsupply: Hiper Type-R MKII 770W
Motherboard: ASUS p5q lga775 (ddr2 1200)
CPU: Intel Core 2 Duo E8400 @ 3,00 Ghz
Memory: 4gb Corsair Dominator 5-5-5-15 (2 x 2gb 1066 mhz)
HDD: WD 36gb Raptor 10k, WD Caviar 200gb, WD 500gb.

I want to install OS X Leopard, but I still want to have my Vista installed. I guess that this is possible, but do I need some special program to do this, or do I choose OS when my computer boots? And how do I make a partion on my 200gb Harddrive to have my OS X on?
I have read SOO many guides now on how to install, but it's always different it seems, and I guess joining this forum was a good idea, because you, experienced guys know what's best for me. Wich torrent should I search for/use and so on?

At first I wanted to use Snow Leopard, but I figured out that I need leopard first (?) If this is true, I would like some leopard version that's compatible with snow leopard upgrade later on.

thanks for the help.