I think you're the perfect candidate for a Time Capsule, since you won't have to plug it in to get good regular backups. Sorry for your loss, BTW.
Do the first Time Machine backup with a wired connection and it will take much less time. Then unplug the laptop and you can do all your subsequent backups wirelessly (and, of course, automatically). Makes perfect sense for a portable computer. (Note: mine is wired to my iMac so I don't have direct experience with wireless TM backups.)
I recommend the Time Capsule because I've had such a good experience with mine, and I think Apple has resolved the heat/capacitor problem of a bunch of 1st-gen TCs. Admittedly there's not much evidence either way, and reasonable people can disagree -- there's no lack of postings from the many people who did have their 1st gen TC die around 18 months old. So, many will warn against buying a TC.
I love my TC for reducing clutter and power usage, convenience, upgradeability (yes--I easily upgraded the internal hard drive), and most of all for taking the error-prone human action out of the backup process.
Also, you can backup your iMac and your Mac laptop(s) to the same TC.
Regards,
Brian33