I use a Park Tools CT-3 (as mentioned last time this thread was active) for singlespeed up to 8-speed chains, a Shimano TL-CN32 for 9 & 10-speed chains and specific Campagnolo tools for their 10 & 11-speed chains.
I've found the CT-3 a bit wide to use on 10-speed chains, hence having the Shimano tool in the arsenal. Campag 11 has a couple of unique steps, which is why those chains REALLY need their own tool. I could probably us the Shimano tool on Campag 10, but we've got the tool at work so I use it.
Just ride the bloody thing and enjoy yourself!