Welcome! As a recent owner myself, I also looked at simple mods to do. First and easiest are clear side markers if you don't have them already. Easy DIY. I next added the Dension to my PCM so I can play my iPod and flash drive mp3s. Later, I'll switch to some forged wheels (for lighter weight than stock) and add an aerokit. I've always loved the look of the aerokit on 997s.
Power-wise, I'm totally happy. I know I didn't buy a 997s for drag racing, so I"m not worried bout that yet. at most, I'll do a Tubi exhaust for sound, x51 headers, *maybe* cats and Softronic. The day I can utilize more power, I'll probably want a Turbo or GT3 =) Oh yeah, and I'm planning on doing PSDS with my wife some day!