4wheel drive 20s

ok im susspose to be gettin a tahoe in the next 2 or 3 weeks.its gotta 6"suspension,3"body lift.its got 36"trxus with 16.5"rims.im wantin to either switch to 35s with 20s or 37s with 20s.where can i find rims,i found welds but there 500bucks plus a piece,i want somethin strong but i wont be goin in ne mud so i want chrome.also do u think i could fit 37s?crank torsions up a little to clear em?post websites about the rims please and ur opinions on tire size