Suppose you had about US$200 to spend on upgrading your regular commuting rig. What would you think about doing first? I'm not talking about repairing or replacing worn out components, or getting something you don't currently have at all, but actually changing something out for something better/lighter/faster/cooler/prettier/nerdier/ whatever...

I know $200 isn't a lot, and I know we might all have different ideas of where to put our cash, but I'm looking for some ideas of what to consider :-)

***edit:

I guess I should have specified: The ride I'm most likely to blow some cash on is my daily commuter - a 2010 Kona Dew Drop, with a Topeak Super Tourist DX rack (utility), planet bike fenders (all three), and pretty much stock in every other area. Probably less than 1000 miles on the drivetrain, so nothing has serious wear on it yet... I have some adequate Avenir Panniers, and I'm not expecting to replace them until they wear out -- I'm mostly a fair weather commuter (rain is fine, but I prefer to avoid it if I can). I also have a late 90s Kona MTB but it is mostly my backup/ ride with the kids bike.