Thanks for the info everybody.
I went for 'Eagletree seagull system' the cheaper version, 900mhz x 200mw, from HK.
The reason being it supposed to have TE[total enegy compensation], but the airspeed does not work on the one I got.
Its not worth the trouble to send back to HK, and Eagletree do not seem to be of much help, as I did not buy it directly from them[basically they are ignoring me after they found out I got it at HK]
The vario part works OK, but it needs the TE[airspeed] to dampen the false readings of the vario when the glider speeds up and slows down[loss and gain of height for a trade off in speed but not due to rising or sinking air]