ok, lets start,
17" is good if u wan more comfort
18" is good for sports....not comfortable though but looks good....so wat the heck
1.5K budget....not much really....Wedsport SA67R or SA70 replicas are good and looks nice for celica...if im not mistaken selling @ 1.6K for 17" and 2K for 18". But replica rims doenst have much offset (not nicely flushed look)...offset is 40+ and best for celica is (32-38)
Again if ur a speed demon then get Japan Rims....cost u 2-3K used and 4-5K new...
but if u are a carefull driver, replica rims are just fine....light too
My 2 cents
Wedsport SA70
SA67R