I'm need help with which computer to get for online poker,

I've been playing poker just over a year now manly live poker, either casino or local pub league,

I do play now and again online but just on my iPad but just when I'm bored really,

I'm looking to play a lot more online and looking for a solid computer setup,

My plan is to use online poker more for training and to gain experience that I can take back to live table,

So I won't be playing more than 4 tables really, will be looking at pt4 or holder manager to be running as well, along with playing some music in the back round.

Can anyone point me in the right direction for what specs I should be looking at.

For a screen my looking at a dell ultrasharpe 24" seems to get good reviews for poker players

I'm from the uk and looking just to buy something off the shelf really

Thanks