If you are on a budget then buy quality so you only need to spend your money once. Youll be happier in the long run.
Any of the Hyperion stuff is top shelf. The HP-EOS5i is another great unit and only costs $80. It charges and balances perfectly.
As for lipos I would go with the any of the Poly-rc or PolyQuest line. They last for years.
The Sv does not have a low voltage cutoff (LVC) for lipos. KintecRacing.com has them for $20. Ask them about lipos or chargers, bet they give you good prices.