+1 for Scrypt and I'm going to tell you what you know but what nobody said over here.
1. If bitcoin crashes, you can sell your computer for atleast 50% (bc the GPU's will decrease in value), you wouldn't be able to sell ASIC's
2. Right now it's more profitable, and the good this is that different altcoins come out, so the total Hashrate gets distributed to a lot of different coins. For example, if Dogecoin wouldn't exist, then LTC's difficulty would probably be at 6000 now.
3. Even though ASIC's for Scrypt are only months away, different variation of scrypts will come out (like N scrypt for VERT) that won't allow ASIC's to mine them. And I'm sure that then a whole bunch of new Nscrypts are going to come out.
4. If one day you're bored, disconnect one of your GPU's and use it to play videogames. Minecraft for example...