What markets are you intending to trade? I hope you have decided to change your approach from buying UK shares directly as you intended before. Run some calculations and you will see that if you day trade UK shares by buying them directly you could easily end up having to double your money each year just to pay for the 0.5% stamp duty (400 trades using half of your account on each) , and that is without even allowing for trade costs.
I have explained before why it will be so much cheaper for you to use spread betting if you want to trade UK shares. If this doesn't appeal then trade a different market eg US / European shares.
Myself I use IB for trading the German market and IGindex for the UK market for the reasons I have mentioned. I'm perfectly happy with both.