Thank you for the detailed response!
After some e-mail exchanges, I found out the following:
1. A master key is about $186 at one local dealer. A valet key is $86. Reprogramming is $50 regardless of quantity of keys. Supposedly, reprogramming changes the frequency of the keys, so the other old keys not in my possession (possibly floating about there in the world) won't work with the engine (but still work to open doors).
I think I'm okay with that (otherwise it is $4,000 to get all new keys and to disable the old key system according to another dealer!). More importantly, my wife is okay with that.
2. I'm getting the lights checked out at the dealer as soon as the keys are in.
3. I just found out (silly me again!) that the tires on the car are not stock. They are Nankang Sport NS1 (215/45/17, I think). From what I understand, these are pretty cheap Taiwanese tires with poor quality control. Yes, I know... I should've checked before I bought. But there were some unfortunate circumstances that led me to buy this car in a hurry.
In any case, I always had Michelin Energy MXV4 Plus tires in our past cars. Consumer Reports seems to think very highly of Falken Ziex ZE 512 tires and Bridgestone Turanza LS-H tires, so I think I'll stick to what I know (Michelin) or try the Falken or Bridgestone Turanza tires. The current Nankang should be okay for about 10,000 miles (I hope...). Or should I be safe and get the "high performance all-season" Michelin, Falken or Bridgestone now?
4. Rear emblems are about $80 per set in chrome. Labor, though, is about $100 (ouch!). But my wife wants them, so she will get them.
Thank you again for your detailed comments. I look forward to more comments and advice.