Dell is pretty good as far as I know, one of the better prebuilt computer suppliers for this country anyway. You could even get one of the less decent Dells and customise it with your own components if you know exactly what you want in your PC

Don't get a Mac, no - you have to be mad if you want one of those Unless you're a hardcore artist or something, otherwise stick with a PC More support for PCs anyway (both in terms of troubleshooting, and hardware/software you can get for them), since they're so much more common than Macs