+1 on bigger boil with a cheap, homemade immersion chiller. I have been using one myself a while and haven't been happier. Plus, it is much more sanitary for your wort to be chilled rapidly, and get covered up (with a lid + airlock), rather than sitting around, waiting for contaminates. Even an icebath can take too long. BTW, when it is convenient, you can combine an ice bath with the immersion chiller for better effectiveness.
I just used 30' of copper tubing, 1/2", 2 compression fittings, and 2 brass barbs so that the hoses could attach to it. And also, I have to do my cooling in my sink, so i had to buy a sink - to - garden hose attachment, then a garden hose to another brass barb. I froze a 2-liter full of water (well, not so full that it burst) and used this for a guide to wrap my copper around, and used a coffee cup for the sharper angles. Sounds complex, maybe, but it took me no more than 15 minutes to have a working chiller. And much cheaper than a store-bought model.