$750 sounds like a good price. How many gears? If you're unsure about whether to get something 'that nice' look at other stuff you've boughten. If you tend to use things until they're used up, a better bike is probably worth it.

For rainy Tacoma --Bare Minimum--

* A bike should have a good derailer like a Shimano 105 or better for quick smooth shifting
* If your route has hills, get a triple front chain ring
* Full fenders, front and back. Maybe removable ones for summer
* Waterproof shoe - because shoes don't seem to dry in time for the return commute
* Headlight - so the cops don't ticket you

Hauling a laptop is tricky. I cracked a display by carrying mine on the bike rack. The padding just wasn't enough. A backpack or pannier are your best bet. If you take a fall and wreck it, your employer may growl!