I've had my Compaq laptop for about three months, and can't believe I lived without it! I have a modern (under a year old) desktop, but love the mobility of the laptop. I plan on taking it cruising this summer. I have WIFI built in, and hope to buy an antenna that I can mount topsides so I can have internet at the marinas now offering WIFI to the mooring fields.
The computer cost about two grand when all was said and done. I got an insurance plan thats good for 4 or 5 years after the warranty runs out, which includes a new battery every year, and accidental damage coverage. Get a good warranty/insurance, just in case you hurt your screen! I know everyone knows this, but you always should take it into account. The system shouldn't have cost so much, but I made it to a personal goal, and wanted it THAT DAY, so off to CompUSA I went.
Remember, another option for a computer onboard are those Shuttles/small form factor PCs, or that new Apple pc. A friend has a Shuttle onboard with an LCD display below, and he plans to have a small (8") touchscreen display in the cockpit by summer. A nice system indeed!!! AND if you make it yourself, works out to roughly the same, or a little more than a new laptop. It also gives you the final reason to get that LCD monitor you've been salivating over.
Just my two cents (and lack of sense?)
Chris