I've owned 4 Macs and at least that many PCs. Years ago, Macs hands down had advantages over PCs in the graphics area, but no longer. Other than the sexy interface and cool design there's very little difference if the specs are similar. As far as your software is concerned, it's just an operating system. Photoshop doesn't care if you're on a Mac or PC. It's going to act the same as long as it has what it needs spec wise. There are plenty of cheapo windows laptops out there. Many people upgrade to a Mac after becoming frustrated with their POS cheap Windows laptop. Sure, you bought a cheap POS. Apple doesn't go after that market. They build a quality machine and you pay for it plus a little more, but there are quality windows laptops out there as well, more expensive than the cheapos, but less expensive than a similarly equipped Mac. I would suggest if one were to buy a quality Windows laptop instead of a POS one, they would be happy too.
I have a Windows desktop with plenty of horsepower for editing, but I also took my son's 5 year old laptop and installed Linux on it and use it pretty much just for internet and it is every bit as fast as my desktop for this purpose. Something to consider with yours if you get a desktop for editing.
What do you use your present computer for?
For instance:
Photo editing = 30%
Internet (surfing, email, etc.) = 60%
Word processing = 5%
Music = 5%
How old is it? What are the specs? (processor, ram, etc.)