Hi There is the Shuerido Waza gi which is cheaper and lighter than the K-10 and also very lightweight. Just under £120 i think Me and my daughter personally go for Tokaido. They gi's are great quality and the Nissaka is a lightweight gi (10oz but doesn't feel it) and at quite a resonable price. I paid just under £40 for ours, maybe have a look at some size guides to see if there can be any help to finding the perfect fit for tokaido?
I personal like Tokaido, there a great brand. They have a Bujin Shiro, which is 14oz and tear resistant. From what i've been told it's great for 'rough' training. I have just purchased the Bujin Kuro (Black Version) for my daughter who loves it.