My tires are getting worn down and I was thinking of replacing my 19s with 20s. What do you think?

Kala Beige Metalic w/ RBs.
Not sure how chrome would look? Good buy?

http://portland.craigslist.org/mlt/pts/841749018.html

Seller wants $1050 for them. He said it was a staggered setup.
From link above...

20" Wheels and Tires. Wheels are 5-lugs,No Curb rash and are like-brand new. The tires are by Faulken, model # S/TZ04 and are P275/45R20.

Both wheels and tires have 3250 miles on them and are in a brand-new condition. I purchased them in January for $1650 for my BMW X5. I am willing to let them go for $1,050 or best offer.