need some help ide like to get lion but idk if i have to get sl first or what im fine with sl heres my specs

amd athlon II x4 630 2.8ghz Socket AM3
785g chipset
Cache Memory

• Type L2 cache
• Installed Size 2.0 MB
• Cache Per Processor 2 MB

dell i570-7034
6gb ram
ati radeon 4200 (getting geforce tomorrow)
dw 1525 wireless
idk whatelse to put

need to know the boot cd i got sl retail and need bootloaders and crap let me know what you need to know