Hi. Wouldn't going for an import just be a pain each time you wanted to add to the system or any problems etc F1 seem very popular at my home spot and I've used most there range but haven't really used much else apart from the old S/S I learnt on.
The S/S is the only one I haven't tried , using the Eagle and phantoms. It took me a few sessions to like the eagle , very pitchy and I kept back winding the wing on the gybes as it's just so fast. Now I've got used it I'm loving it , however your already on good foils !
The new Unifoil Hyper2 looks pretty good but another to consider is the Fanatic Aero Free 1000 on the 82 TE mast which is high mod. With the 60 fuse turns good and is pretty fast with good glide. The 800 is super good if windy too??