Techron is very very good, it's what most mechanics in my area (im saying my area so no one flames me, but it's probally a lot of areas) use techron on cars they give tuneups to, or fuel system clean packages.
Gumout regane is also pretty good.
Synpower is probally just as good as the regane, they both do a fine job like the techron.
Seafoam I havent tried, i'd run it through a vaccume line, but in the gas tank I doubt it'd do anything at all. Just like STP fuel treatment in that reguard, it isnt anything special.
Go to AAP and get the buy one get one free on techron while they still have it, buy a few bottles, don't buy out the store cause advance auto usually has a free fuel system cleaner offer every couple of months.