First of all, you've made excellent progress, and I hope you recognize that and don't get discouraged.
There's some good suggestions here, like tea to help boost metabolism. I would also agree that you may be eating much too less for your goals and you're body may have stopped taking from fat stores and instead keep them around because it thinks you're starving. Also, even though you've lost 60 pounds with a 1200 calorie diet, do you know how much of it was muscle mass? I know I was extremely calorie deficient for a month or two a few years ago and lost a lot of weight, but also know that I sacrificed some weight that's beneficial to have around.
Supplement Suggestions
I suggest you try to focus on improving your diet and training before looking into a supplement, because unless you get those two things right, I expect you'll be disappointed with the supplement. But if you really would like to add something to your current routine right away, I recommend tea, or grapefruit with caffeine. Let me know if your on any medications, though, because grapefruit can cause problems with that. Basically the grapefruit with enhance and prolong the effects that caffeine will have on fat metabolism. L-carnitine will also help to metabolize fat better and you can get it pretty cheap.
Training Suggestions
I think the cardio is a little excessive and maybe too intense for best fat loss. A good pace for cardio with the goal being fat loss is probably a power-walk or light jog pace, at least in my case. This would be around 130-145 bpm heart rate I think if you have access to that. More fat will be mobilized for energy use at this less intense pace, and while intensity increases so does the amount of energy you will use from more immediate glycogen stores of energy found in your muscles. 45-60 minutes like this everyday should still be alright. And you could probably increase the weight training if you do this to 30 minutes no more than 5 times per week.
Diet Advice
I'd say you should eat more. 6 meals a day with at least 2 hours between them. This helps to keep metabolism high. From the calorie calculators and such that you can find online it looks like you could get away with close to 3000 calories per day. But since you're actively trying to lose weight, I would say 2400-2500 would be more acceptable.
Now for what to eat. I'd try to focus on keeping insulin levels balanced, which means minimal sugars like it looks like you've been doing. Low glycemic index carbohydrates should be the only ones you eat right now. And in fact, overall low carbohydrate diets I've found to be good for fat loss provided you follow some rules.
1) Most carbs should come from fibrous vegetables or fruit.
2) Always eat fat with carbs to slow the digestion down so there's less impact on insulin.
3) Don't eat protein and carbs alone without fat, as this will have a bad effect on insulin.
4) Every few days allow yourself to have one good meal with a lot of fat and lot of good carbs (oatmeal/sweet potato), but no protein.
5) Protein and fat can (should) be high on a low carb diet in order to meet calorie requirements.
In case you're wondering where a lot of those ideas are from it's
CUT DIET.COM
which is a good read. I've adopted many of those strategies in the last 11 weeks and had good results. Lost 30 pounds total, only 2-3 not from fat. Only thing is that the training outlined in that book might not apply to you.