your easiest bet will be the vance and hines fuelpak. it's very easy to install and program.
however, if you plan on future engine upgrades (big bore, cam, etc), or if you want to be able to tweak your settings at home, you should look into the tfi, power commander, tts mastertune, etc. these tuners have a wider range of tuning capability to deal with upgraded engine components.
tfi - good cause you don't need a computer - only a screwdriver to adjust settings - it works on the same principles as a carb.
other units (power commander etc) need a computer and dyno time to tune correctly, but they have a much wider range of tuning capabilities (ignition curve adjustments, individual cylinder settings, etc)