If you must go for Suntech I would be inclined to go for the polycrystaline wd+ panels, you gain a whole extra 1 watt at NOCT

. I have just had the 245WD fitted and am not impressed by their performance compared with my older system consisting of Sharp ND210 E1F panels - and that is in hot, cold, & low light conditions. My Suntechs are the monocrystalline ones whilst the Sharp are polycrystalline.
See this thread:
http://www.navitron.org.uk/forum/index.php/topic,15188.0.html As always this is just my opinion based on my experience, as always DYOR

Roger