Should I buy this? 09 Sedan S w/ TRD 18" - $18K

[babu]

Hello. this is the final quote i got. Please suggest on 3 questions below -

2009 Type S Sedan Silver
All-weather Guard &
Power Packages
Carpet floor/trunk ats
TRD 18" dealer installed wheels and tires 215 35 R18
$18,000 after all rebates and discounts. Plus ~$1,100 (tax, token, etc)
Dealer will pay back $500 for the 4 15" alloy wheels n tires with the power package. So, all together, looking at $18,600 out the door.

1) Is it worth it? If not, what should be asked for?
2) Will the 18" TRDs give trouble driving w/ 4/5 average passengers? Like rubbing against wheel-panel/wall? Or any other?
3) Can any of u post your pictures here, if you have 18" TRDs?

Look forward to your kind responses.

Anxious