xenon has only dipped xenon beam headlight & halogen main beam, bixenon has xenon dipped & main beam headlight, the latter being better
The auto levelling system actually makes the headlights keep the correct range on the road so if you have a full boot usually your headlights end up in the sky, where as auto levelling counters this with sensors so the headlight motors lower/raise them when car level is abnormal & when it returns to normal, very much worth there money
But best Headlights are the Adaptive Bixenons that I have fitted, alot more work involved but they're ****** good I tell yer, but you dont wanna do what I did if you're not technical as such, bixenon will be enough for you
TP means Trade Parts Counter TPC infact
Do you mean this one:
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MESELX:IT&item=160314669189
Cause thats a fair price.