Hi Dave, and welcome! As Cyclops said, Cosplaysky is towards the bottom end quality wise, but if you're after something that wont break the bank, it's a decent choice (I went with cosplaysky for my jedi robes
). You will definitely want to get a new belt as the one in the set will not be approvable. I don't remember where I got mine from, but I'll search the memery banks and get back to you if no one else provides a good option (it may have even been from the cosplaysky link you posted above).
Ultrasabers is approvable, and a good option again if not wanting to go too extravagant. Money can be saved if you get a stunt saber (no sound).
You can find some boot options at Costume Creations (out by Aussie World/Ettamogah Pub). They are approvable, and will run around $80-100. Boots will be important considering you may be trooping in them for hours on end, so something comfy and long lasting is a good choice.
If you're going for a robe as one of your optional choices, you'll need to upgrade from the one cosplaysky does. I went with a Museum Replicas robe. Good quality, and meets the standards. I was lucky enough to get one from Scifi toys in Australia, on sale, but this was over a year ago, and it looks like they don't have any left. Another option is to get one made for you. I hear nothing but good things about mammasiths work.
Sorry about the long post
Feel free to drop me a message if you need any help.