hmm.. Where do you ski mostly? What else do you do other than short turns on groomers? What is your ski ability level?
Shorter skis make for easier turns and a more "fun" feeling...but they can also become a handful in uneven terrain, crud...and aren't nearly as stable at high speed (more likely to fall if you make a mistake). It's a balancing act to find the right length that will be most "fun" yet provide the stability you require.
As for waist size - depends on the terrain, but if you're doing mostly short turns on groomed hard pack), something the 60s...low 70s. One ski that I demoed recently, and really liked was the Dynastar Contact Groove - it would be great for carving short turns. It's a very easy to use ski...especially on hard snow - For softer snow, the Xenon 8.0 might be another good one to try. I'm an intermediate skier and had fun on both of those.
As for boots...get the ones that fit, there's nothing else to tell you there. See the 'Ask a boot fitter' forum here. Ideally, you should go see a professional boot fitter. If that's not possible, read as much as possible about ski boot fitting and make sure you don't make the mistake of buying too big, which is *very* easy to do if you've never bought ski boots before. Oh...don't buy ski boots online... I've seen a few people who have made that mistake here and regretted it.