Those look like a great list. I take fiber too - it really helps to keep my system working properly.
I would try to wean yourself off the diet soda. I know it seems harmless, but many studies are showing that drinking sweet drinks - even if they are "sugar free" - affect your body and brain. If you convert yourself to a non-sweet drink, like caffeine free tea or something, it can really make a difference. Make sure you drink lots of water!
Building muscle REALLY helps with long term weight loss so I highly recommend that.