Unless you really know what you are doing don't even think of day trading. Consider this. With just one initial trade of 1k shares and no other trades, when AAPL completes it's latest 4 for 1 split I will own 56k shares. I did add 1k shares @284, so I will own 60k shares. Just do the math. very few skilled day traders could beat that return. Think long and hard before you venture into day trading.
Spend as little on hardware.... splurge more on your margins, cause you're going to need it when it's not going your way....