battery and lens info

hey everyone.
im seriously considering purchasing a dvx100 for surfing filming. ive heavily reasearched the camera tech info and it sounds brilliant.
my problem now is with getting the accessories to suit me.
i need a tele zoom lens for my purpose...preferably between 1.5 and 2.0x. i have found the one 1.6x century optics lens...does anyone know how much this retails for? US or AUST? and do you know of any more to fit the 72mm thread size.
i also require a relativly long-life battery. hoping for 5-10hrs normal recording life. i saw the CGAD54SE battery on the US panasonic website and assumed it was the longest life one because of it being the most expensive. it was $189US. can anyone tell me if this is the longest life battery, how long it lasts for in normal recording? and also how long the standard battery lasts for?
thanks for all your help.

i bought one from this guy on ebay. it works great and was a really good deal. He still has a few left. its 2x and has a 72mm thread, so you wont need an extention.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=64327&item=7514590264&rd=1&ssPageName=WDVW

yer i already saw those but i kinda bypassed it as i wasnt sure of the quality seeing as it was only 99US and that it had no info on what brand the lens was.
was there any loss in picture quality whatsoever?