The shoes you've linked aren't really what comes to mind when you think of "boat shoes." Those are canvas sneakers with a moc toe and 360* lacing. If you want to stay in the sub $100 range for a pair of real boat shoes (leather, hand-stitched toe and heel, razor-siped boat sole) I would suggest the
Timberland version over both Sperry AO's and Sebago Docksides. I've had three pairs and I think they're the best in their category. Padded tongue, razor-siped, welted sole, comfortable out of the box and no seams in the upper to rub your feet raw. Plus, they can be had for about half the regular price at a Timberland outlet with a coupon.
If you want to step up into the Made in Maine category, I'd recommend
Rancourt.