Buxtyy wrote Anything will be fine for graphic design, it mainly depends on the programs you wish to use. If you've decided that you want a Mac and the software you use is on OSX then thats fine.

never had a mac before but the uni uses Macs so i need one , Not sure what software etc i would use.

Most people find Adobe CC to be the best option, they offer discounts for students and rather than the old way of charging for one license, they charge monthly so you can choose how long you want to use it for.