It looks like I'll be purchasing a set of 20" Sevas S-55s black w/ chrome lip. 20 x 8.5 all around with 40+ offset all around. How will this non-staggered setup affect handling, comfort, and just overall ride quality? How do you all think this would look?

 

They should look great but I would go with the +38 instead of +40. As far as handling is concerned you probably won't notice a difference over your stock handling I would imagine the ride quality won't be as good as your ride now with 18" that's just the nature of going +2 on your wheels. The Sevas is a good quality wheel they'll look great and last a long time. I am thinking of the S-55s myself but staggard.