Alston makes some nice stuff. Used them previously in my car. You will probably end up doing some minor floor cutting and rewelding, but not too much. I put a Morrison ladder bar setup with crossmember in a Foxbody. Welded the driveshaft loop to the floorpan hump, rolled the carpet back and put the rear seat back in. My newest setup is from Smith-Racecraft, but I don't think they sell their Ultimate Ladder Bar kit any more. $1,500 I'm guessing you are buying the whole subframe kit, bars, locator, coil overs. S&W Performance makes an assortment of direct fit frame rails for narrowing rear chassis.
32" is a good length to be at. I like ladder bars for ease of adjustment, and the car tends to launch straighter since the bars act as an antisway bar at the same time. Moderate hp cars that are pulling the left front wheel up tend to stay on the ground more with ladder bars.