Welcome to GenVibe Eric! I see your Vibe is the best color

! Check out
Grafx Werks for some cheap mods for your Vibe. They sell overlays for the front and rear arrowhead badges and Vibe badges. You could also remove the Vibe badges completely for an even cleaner look. They're held on with double sided tape. Simply use some fishing line to "saw" back and forth behind the badge until it comes off completely, then use a hairdryer and WD-40 (or the like) to remove the leftover adhesive.
Another cheap and easy mod would be to change out some of the exterior bulbs. LED bulbs are great for the license plate light, reverse lights and interior lights and LEDs pretty much last forever. Check out
v-LEDs. Their products are great qualtiy and really reasonably priced.
An intake would be another cheap and easy mod. I'm not too sure on what's available for the 1st gens (2003-2008) since I have a 2nd gen (2009-2010), but if you search around here you will find plenty of helpful info.
Best of luck and be sure to keep us updated with any mods, etc. you do to your Vibe

!