I run Mepis linux on an Intel 5 quad core HP laptop I also run Mepis on an 8 year old plus desktop and both are super reliable and very,very fast. If you have poor Net speed then a fast system helps a lot.
Mepis costs $ 30 for the operateing system and every programme you can think of, it is known as the easiest transition from Windows/Mac to Linux and i agree. You can set up a faster and more powerfull machine than any Mac, for @ 50 % or less of the price.