If you can play well with both hands, you'll never need tracks, especially with that set of styles you play in, heck, play LH Bass and add a drummer.

I play part of the time in a 4-piece, two guitars, drums and me (only the drummer isn't a singer), and partly in a duo with one of the guitarists. If both the guitarists are decent, you don't have to play too much with the RH, colors, pads, keyboard signature licks, keep the LH solid, you're in business.

If you wanted to add a bass player instead of a drummer, I would only do that if you have one of the arrangers famed for it's 'live' drum sound (newer Rolands, Ketrons, etc.) and then make sure the onstage monitors play the drum part darn near as loud as a real drummer. For some unknown reason, guitarists have a very hard time adjusting their playing - honed from years of playing in deafening garage bands, I guess - to the politer drum sounds and lowered volumes that typify arranger use.

Once you have trained up that LH well, you also have the option of even duo work (probably 50% or more of my duo is just drum part and LH bass) being less reliant on all the machines, and the public tends to like seeing someone actually playing the parts, especially anything other than just the rhythm stuff (again, even with arranger use, I tend to turn off nearly all the parts, and just have Bass/Drums/Comp done by the arranger).

Unfortunately, I have hardly ever seen a local band with a drummer make good use of tracks, especially arranger tracks. There is just something out of whack with the expanded dynamics of a real drummer (even if you get him to choke down, he's not going to enjoy it!) and the compressed dynamic of arrangers. If you get a drummer, especially as your songlist is not really keyboard heavy, just forget the machines. You'll be a better player for it.....