tbird- first off congrats on the car (bet you cant wait) and nice color choice.
since you plan not to lower the car, why not just get the stock size
15" and tires? 15x6.5 and just run 195/55/15's?

you can ask the
tire place to remove the TPM modules from your 14's and mount them
on the 15's or just not run them at all. i have a TPMS light on all the
time but i dont care cause i check tire psi often.
as far as offset, the sport's stockers are +55mm. so your +45 will
stick outward by 10mm. shouldn't matter cause as far as appearance
since the stock 15's are tucked in too far anyway. as far as clearance
from rubbing, i think you're fine. if you want to take it real safe, get
wheels that are 6" or 6.5" width.
most car manufacturers sell wheels that are tucked in to allow the
user to use chains on some mountain roads. chains can stick out as
much as 10-12mm... so shouldn't rub.
hope this helps.