wheel decision / tire size question
 

I was looking at 22inch wheels, I was trying to figure out the recommended tire size so I can ask my buddy who has a shop and see if I can work something out with him.

These are the wheels..
22" WHEELS BMW X5 4.0 4.8 X6 2001 - 2008 RIMS E53 E70:eBay Motors (item 400045361577 end time May-23-09 17:41:47 PDT)

BTW I can get brand new 20 inch replica style 87's with Hankook Ventus RH06 tires for about 1300? Should I take this deal over paying 2k+ for 22 inch wheels and tires?

Honestly what are the draw backs of 22 inch wheels? I love the look but question the practicality..i am trying to decide before these two setups..the summer is almost here! (this would be a warm weather setup only. I am running 18 inch sport wheels with michelin dimaris for the winter)