Have a think about exactly what you're likely to use it for. If you are going to carry it far and wide you might want something light, if it's going into luggage you might want something compact and if you are going to want to get into awkward positions you might want something that enables the centre column to do something other than go straight up and down.
Once you're decided on some priorities your search can begin
When I use a tripod I use a Benbo because it enables me to get my camera into positions that an ordinary straight up and down one wouldn't allow. Plus it's much more stable than my previous Manfrotto 055.