Bottom line: Based on your stated use for weekend projects any of the three brands would be OK. In fact, given the low cost of electric drills they are essentially disposable so almost any brand/model will do.
Drills are not precision instruments so for weekend use anything costing more than about $30 (CDN) should last at least 5-10 years.
I did try to get some objective advice for you, but most on-line reviews are of either cordless or hammer drills. It appears that a simple corded drill is beneath the radar for reviewers. That said, the link below does provide spec. comparisons for a range of corded drills (organized by size ... i.e. 1/4", 3/8", 1/2").
On the question of the three brands you mention I generally avoid B&D if possible (except their DeWalt higher end models), so personally I'd go with Skill since it is generally less expensive than Bosch. But you could also consider Rigid, Ryobi, Hitachi, Makita, Milwaukee, Porter Cable and many others.
That all said, consider whether a corded drill is your best option. There are some pretty good cordless drills out there for not that much more money. (For example I recently bought a really well designed 1/2" cordless model (18V) ... a house brand sold in Canada by Rona for $89 (See second link). It has a three year replacement warrantee (better than drills costing 2-3 times as much) so I couldn't go wrong). The nice thing about a cordless drill is ... well, there's no cord. Gives you more options.
Alternatively, consider a hammer drill. You can use with or without the hammer action so it serves all the places a regular drill will, plus it's great if you have to drill into concrete or stone. But unless you envision doing just a few holes in stone/concrete or will be working where there is no power I'd recommend a corded model.
Hope this helps.