Don't buy second hand lipos! Often they are at the end of their life and you never know what you are buying.
You can get brand new, BRCA legal, UK supplied lipos here cheaper. They are pretty good - I have used them for 4 months with no probs.
http://www.giantshark.co.uk/gens-510...-p-407514.html
I would avoid Zippys especially the saddle that are offered (Very large and lack punch) - Out of the 12 pack of lipos I own the only ones that have died are Zippys (3 packs).
The Turnigys are very good and would recommend those - you can buy them brand new here for not a lot more.
http://www.hobbyking.com/hobbyking/s...wer_Search.asp
Dont know if you have bought yet but JE Models have an X2C at £115 new
http://www.jemodels.com/electric-mod...50&keyword=x2c
If you are after a cheap charger this would do a good job for £29.
http://www.giantshark.co.uk/b6ac-bal...-p-406695.html