ThreadMorph: I'm a PC'er because 1) I have a huge suite of legacy W'Doze warez that I don't wish to shitcan/replace and 2) I've never been an AppleCorp fan -- and I date back to Apple I days. I'm sure a Macbook is fine for its customer base. I just ain't part of that.
cwood recommends a Dell. I have been ripped off by Dell and will have nothing more to do with them. Check their history of knowingly using substandard and defective components. And my customer service experience was atrocious. Dell (computer) and JVC (video) sit high atop my shitlist. My best experiences were with Sony (computer, A/V, P&S), but that's been a few years. The highest-rated computer firms seem to be Apple, Toshiba, and Lenovo.
Re: my attempt to find a CPU metric -- I gargled for CPU PERFORMANCE and found some interesting charts, including megaflops-per-buck ratings. Some Intel i5's seem faster (and give more bang-per-buck) than some i7's, and some Phenom X6's are right up there (but cheaper). CPU alone isn't everything -- its chipset makes a huge difference, and one site argues that the Intel i7-875k is the price-performance leader. Now I just gotta find a laptop workstation containing it. More research, more research...
So I'm leaning towards Lenovo (T- or W- series) or Toshiba (insufficient data so far). Yeah, a Panasonic ToughBook would be nice, but I hope to avoid hazardous environments where it would be necessary. They're ideal for explosives techies or on-site vulcanologists.