Hey NC, Nice car I have an 05 convert same color and trim. I have had mine since March 06 and use the top a lot or as much as I can from about April until around late October. I haven't had any problems with the top going up and down although I won't put in down if I am just running to the store if it isn't already down.
I use Aerospace 303 protectant on my top and all rubber and the black plastic trim. It lasts pretty much all summer as it is in the garage if it isn't on the road.
I haven't really done any mods to my car as I am not mechanically inclined! Wasn't born with a wrench in my hand so to speak. I did put a K&N air filter in wow wee. I am also looking into getting the rear sequential turn signals installed. I think they look pretty cool and don't cost a lot.
I would love to put a different grill on and add the fog lights like the GT's have but would have to find someone that could to that for me at a reasonable cost.
Kirk