The twin I-beam suspension the Fords have are pretty sweet. I believe they also had it in some of the Bronco II models if you're into the mini SUV thing (which, I presume you are if you own a tracker). If I were you, I'd look long and hard at both options (Ford & Suzuki), and think long and hard about what you really want the vehicle to do, and your budget before dropping the $$$. Jeep Cherokee's are a pretty cheap option these days too, but I think they're uni-body.
I wouldn't do the 2.0L AND a turbo. It'd be much cheaper & easier to do a Suzuki V6 swap if the 2.0L isn't enough for you (which - it SHOULD be). I know 130 HP doesn't seem like much, but it's ~30% more power than the 1.6L 16v and ~60% more power than the 1.6L 8v.
Track width is a large consideration in stability |removethispart|@ higher speeds. The 2-door is going to be at a disadvantage here. But, it will have a significant weight advantage (easier for suspension, HP & breaking). So - pick your poison: extra weight & stability, or less weight, and less stability?
You can probably drop $700 into OME springs, shocks & struts and be happy (just have realistic expectations: dessert runners spend $700 on ONE shock). I drive my 4-door 5-speed on dunes & fire roads between 40-60MPH depending on "track conditions". My OME suspension & 29" tires eat up all but the nastiest rocks & pot holes (which are usually easy enough to avoid). I've also jumped my junk in the sand dunes (read: softer landing), and been very happy with the landings.