Depower confussed - please help

[Trapdoor]

Have been flying stunt kites for about 15 years and got into power kites about a year ago. first kite was a Flexifoil Rage 3.5 but I am looking for more lift and a greater range of wind. So far I have been static flying but I am looking to get into buggying and maybe landboarding.
I think Depower is the next step but i have no idea what kite to get. I saw a Radsails Evo (Mk1) that was quite cheap but I do not know if it is any good.
I am on a tight budget but still want a decent kite that I won't get bored of. I weight 13 stone so I thought something between an 8 and 9.5 would be about the right size for the greatest wind range and a decent amount of lift.
Any advice would be much appreciated.
cheers