I just keep buying Dell stuff at delloutlet.com. You can't beat the prices on refurbs and scratch and dents and they're as good a machine as any.
The only reason I'd suggest away from an Apple is the learning curve of a new OS and that they are INCREDIBLY overpriced. I bought one for my daughter last Fall cause she wanted to get some grind time on OSX and I was not at all impressed with the build quality of the machine compared to it's ridiculous price.
I'm a big-time Apple fanboi, so it pains me about their laptops.
I just bout Lisa a Dell Mini at delloutlet last month and she loves it. She hauls it around in her purse for work. I paid right around $250 for it. She bluetooths it up to her iphone hotspot and can work anywhere. I think it's as cool a little machine as they come.
If you loved your mini, go get a new one. I'd suggest purple. Or you can get a macbook air for 5 times the price in white.