Unfortunately, you should lose the extra weight before moving forward with liposuction and abdominoplasty. I know that's not what you want to hear, but there are very valid, tested reasons for that answer.
Liposuction isn't a weight loss tool. Liposuction is to help shape and contour, more of a fine tuning tool. It's best used on exercise resistant pockets of fat that remain once you do get to your goal weight. If you were to go ahead and do the liposuction or abdominoplasty now before you've lost remaining 30 pounds, you may end up wanting to have even more liposuction in the same area after you do lose that weight.
It could be that the 30 pounds will come off of your abdomen leaving you with excess skin that wasn't removed in the first abdominoplasty procedure, so you have the unfortunate situation of perhaps having to repeat a surgery to achieve the look you want. That's a waste of your time and money.
You'll get a much better outcome if you stick to it and lose that remaining weight. I know you can! You've already lost 30 pounds, so stick to your guns. I know that's much easier for me to say since I'm not the one who has to do the hard work to get there. I'd just hate to see you cheat yourself out of achieving the best possible results from the surgery.