For those still getting a feel for the "subtleties"... The B drives more from the center of the kite, whereas the SLE and EXP sails load a bit closer to the verticals... Not waving a flag over either, I have my preferences, but it all comes down to taste, and primarily technique.
FYI, I never use the weights myself, nor does anyone on iQuad... They're for "play", consider them as really basic training wheels for axels and flic flacs.
As for low end performance, an SLE or B sail will do well with a Race Frame and lighter lines (I love 50# in anything under 3mph).
Again, I have to stress though... Technique is 90%, knowing how to load your sail consistently, and how to throw the weight of the kite around, utilizing the inertia you're generating.
I'll tout a B for obvious reasons, but you can't go wrong with just about any Rev... Although the B is packaged for value, no doubt, less $$ than buying a complete SLE and extra frame separately.
Also, it comes with the adjustable knot system already done... Can't tell you enough about what lengthening your top lines by 5"-7" will do... Feels odd at first, but the performance increase is noticeable once you understand how it actually works.
Hope to see a bunch of you at the Portsmouth clinic in August, will be great to make new friends and exchange flight tips!
( i know, i only went to skool for the uniform and free scule meals) a complete new kite, it is my birthday next week after all 
