1st mod wheels or ECU tune

[bdubz]

I recently just purchased a 2011 x35d with 18in OEM wheels. I'm debating on what to do for 1st upgrade.

1) ECU Tune RENNtech or evolve? $1200
2) 22's $1500 - $2000

Feedback is appreciated. My conflict is should I enjoy the stock x35d for a while and improve the visual or will the ECU tune be more fun the wheels can come later.

I understand this is completely subjective, but still would like to know opinions on what you might do first if you had the choice.

Thanks in advance!