The 106's will give you about 4 inches of lift on the rear. I can't tell you about driveability because I did everything all at once. Front lift, rear springs. The bilsteins from a rav4 will fit. I don't think there's any modifications necessary, just a tight fit over the bolts that hold them on.

2001 Sportage, TJ 106's, Everet spacers and bumpstops, Bilstein shocks on the rear, cone filter, Crager wheels, 235-75-15 Goodyear tires. Custom front winch bumper by Dave Scott. Currently DOA, but it is a work in progress.
2011 Kia Forte EX