BEST computer for playing The Sims 3 & 4?

I have been playing the sims 3 on a lenovo because that's all I have been able to afford and the graphics are really poor. I'm saving up and would like to buy a computer or laptop that'd play the Sims flawlessly and the graphics are at its best. I'm looking for something below the 400 range but if you recommend a computer more than that I'll have to save up a little more. It gets old trying to play the sims when your laptop graphics make it hard to enjoy the full extent of the game and lags, but anyways also I haven't bought sims 4 yet because I want to be able to actually play it without graphics looking bad and all that.

Any suggestions?

http://www.thesims.com/faq#what-are-the-PC-recommended-system-requirements

You are going to have to get a laptop with a dedicated card, which makes it quite out of your budget if you want to make at least recommended settings