I would personally go for the LTZ. It has some unique features that really make it stand out visually; especially the silver grill, foglamps and LED tail-lights. The 6 Speed Tap Shift is a very nice option. I love it in my V6 LTZ. It's fun, gives you total control over shift points and provides better fuel economy. You also get Auto-Climate control. leather and the electrochromatic auto-dimming side mirror. Does the 2LT you are looking at have the upgraded stereo? The sunshade is a nice option too, especially if you have "little ones".
Wow. Nice. I keep hunting local lots for the spring package LTZ 4 cyl, but so far all I see are V6 LTZs, 1 V6 LT, several 4 cyl LTs, and a few LSs. I love my V6. The only reason I want to check out the 4 cyl LTZ is out of curiousity of how the 6 sp 4 cyl feel in these cars.