we have a Halifax savings account, looks like it has a similar interest rate as that ing direct one, we're managing to put away 2k a month at the moment but don't want to tie it up in an ISA or anything like that as we're always withdrawing for various things - house, car, hoilidays etc. Assuming you want to keep your money in there for a while you might be better off looking into something better than a savings account like mike suggests.
Thought about getting an independant financial adviser on the case?