Well Im still looking...
Listen to mlawrence. There are already an abundance of online wallets, some of them are fairly secure (StrongCoin), others not so much.
Sadly, the best analogy I can think of is breadsticks: Lots of them are tasteless grain mixtures, others are amazing. Unless you dedicate your life to it, you're never going to make breadsticks as good as the best that are already out there, and you're still very unlikely to make ones that are better.
All you're going to accomplish by making this is wasting about $400 on development and hosting.