I think the type of carbs you should add depends on why you're adding carbs back in. Are you exercising hard and feeling like you need a little more energy? Add an ounce or two of nuts -- macadamias are the best -- because the extra protein and fat will also help your energy needs. Are you eating (not overeating) the proper amounts of protein and fat, but still hungry at meals? Add an extra cup or two of approved veggies, which almost certainly won't slow your weight loss. If you're missing something sweet, try some strawberries with cottage cheese and splenda (my new fave breakfast), or sugar-free yogurt (you can subtract 8g of the carbs on the label, since they're from the lactose sugars consumed by the yogurt bacteria). However, I wouldn't add any of the low-carb dessert stuff back in until you've determined that you can still lose weight even at 25 or 30g. It'll just be that much more unpleasant if you have to cut back to 20g in order to keep losing weight!
When I was still in the weight-loss phases, my own personal rule was to keep my non-veggie carbs at about 10g per day, and then just eat all the veggies I wanted without really counting them. I didn't eat any Atkins bars at all unless I was in an emergency food situation, limited myself to one Pure DeLite bar per week, and had no more than two glasses of wine or low-carb beers per week. I made low-carb desserts once a month and didn't eat more than one serving of them a day. All of that stuff came out of my non-veggie 10g, meaning that I had to cut back on my cream, cheese, nuts, and splenda on those days. I didn't really eat any low-carb breads or crackers, but that also would have come out of that 10g.
Unless you've got a dairy problem, I would think you could eat 30g of carbs as long as only about 10 come from "other stuff". There may be someone out there who stalled from too many vegetables, but I've never actually seen it happen! On the other hand, lots of people can't handle higher levels of dairy, nuts, and sweeteners, and you should probably be careful until you find out if you're one of them. So if there's a particular food you want to add, go ahead, but sacrifice some other non-veggie carbs for it until you get a little better feel for your own carb intake levels!
Oh, and one other thing: if you start experimenting, and you do slow down or stop losing for a week or two, don't stress out about it, 'kay? Nobody is going to jump out of your closet and hand you a prize if you hit goal a week or a month earlier or later
. Learning what you can and can't handle is an important process, so don't be afraid of doing that just because you might stop losing. Maybe you will, maybe you won't, but so what? If you do, the experiment didn't work, and that's it -- think about it like it's science, not like it's some personal failure in your battle with the Devil Box!