I use solidworks at school with their PCs, and I have a Mac at home which can't run solidworks so I need to buy a PC laptop and I would like some suggestions. Take into consideration that I'm fourteen and can't afford anything too fancy.
The big problem with SolidWorks on PC laptops is their graphics cards are more geared to gaming than to CAD. Any CAD program makes huge demands on a PC graphics card, and CAD rated graphics cards cost a lot more than gaming cards. That is why they are seldom installed on low-end laptops. The same thing holds true for desktops, as well, but you get more choices for customizing desktop components, like graphics cards, than you do for laptops; for a lot less money, too. Actually, building your own desktop PC from components is not that difficult and you can save about 60% of the cost compared to store bought equivalents. Check out the Kits found at www.tigerdirect.com. I've been "rollin' my own" for the last 20 years and have saved a bunch of money. The thing to remember is you'll need lots of RAM, not less than 4 Mb, and you'll need a CAD rated graphics card that you can choose from a list found on SolidWorks web site, www.solidworks.com/.
I made a typo; the 4 Mb of RAM, minimum, should have been 4 Gb. On my own system I've installed 16 Gb. For overall increase in CAD performance, increase RAM first, then your graphics card, and then your CPU. - Rio
If you have a minimal budget, a second hand desktop is a good starting point. Check eBay, an HP XW6400 or Dell Precision 490 with dual Xeon 5160 CPU's and an nvidia quadro fx3500 graphics card would be a very capable machine.