You could also give the HSM Firelight a look. Light sail, good power and the 5.7 is quite good and very stable on a 400 mast.
Smallest Firelight that rigs on a 400 is a 5.0. I have Firelight 5.0 and 6.0, luff is 410 for 5.0 and 428 for 6.0. Lovely sails for wave riding, still my favorite sails after nearly 3 years. I used to weigh 95 kg when I first bought my 6.0 Firelight in December 2011. It was my most frequently used sail up until 5 months ago when I moved to Oahu. I now mainly use HSM KS3 5.5, the KS3 has a wider wind range than any other sail I've used, for example the 5.5 can be rigged flat to be perfectly controllable when I should be on a 5.0, but also bagged out to feel like a 5.8. In my opinion a 2 sail quiver of 4.9 and 5.5 KS3 would cover the same range as most 4.7/5.2/5.8 quivers.