Hey there Umar, as an ex 'Jaffa' myself, I can agree with the weather issues you have, though oddly enough, with the sea breezes we get down here in summer (20 knot ones at times) - winter offers the best flying when it's not snowing!
As for Specktrum, my Dx6i has not missed a beat in almost 2 years. I have flown my plane and heli (both nitro) on it with not a single issue other than a rip-off after market receiver c#@**ing out.
Just DON'T run them on a 4.8 volt power supply, keep them on a 5cell Nimh 6volt RX pack at a minimum, and from my experience they are PERFECT! (other than me needing more channels for my heli and mustang)
That said, If I had the chance to buy again, I'd be looking at one of them Futuba 7ch FASST systems on 'Trade Me' for like NZ$380, a bit more than US$200 (well, it is today at least - tomorrow??) but you'll love the extra programming etc you get from it. I think they guy is in Tauranga from memory.
Also, as for support, Phoenix offer all system upgrades and new models FREE, and when it comes to feedback from them via e-mail, they have proven to be quite good so far!