Congrats on your pending boost:thumbup: .As far as rims go,do what you like,but i have found that lighter is better.If you don't mind saving(or spending) for lighter rims it is the best thing.
I use to roll on 25 Ib 17" crome rims but switched to 14.5Ib 17"rims and loved the ride.The small bumps just seemed to disappear:thumbup: .I never thought that rim waight would make a noticable difference,but it really does.

Oh,almost forgot.If you live in a winter climate i would recommend
(if you go 17") to keep the stock rims foe snowtires.