I'm not going to build a shopping cart for you at this stage in the game, you need to do a lot of research!
But I can give you a loose ball-park so you know if it's worth it to read or not.
As of this moment, an investment of $1500 in a new BTC ASIC would net you ~$500 a month worth of coin.
An investment of $1500 in a GPU rig using new parts would net you ~$280 a month worth of coin.
Those figures do not include changes in difficulty, your power costs, changes in coin price, or the end of ze world.