Join Date: Aug 2013
Location: Cincinnati, OH
Bikes: 2013 Trek 520, 2014 Trek Stache 8, 1985 Nishiki Team Issue, 2014 Dahon Vigor P9, State Vice 2.0
I like the Abus Bordo
folding locks, myself. They're compact, and pretty tough. I use one for my commuter, and I have a coworker who uses the extra long version to lock up his and his kids' bikes when they go for rides. Depending on where you'll be locking your bikes up, and for how long, it is well worth the investment to get a good quality lock, whether a folder, a U-lock, or whatever else. Like anything, the better locks may end up costing a bit more, but that cost is often tied in with the durability and reliability of the product's materials and manufacture.
As for bottle cages and bags, those are pretty universal, and you can typically find a wide variety of them at your local bike shop. For rear racks, you'll want to be sure that you have the proper mounting points on the bike(s) to attach a rack, and the proper size rack as well. That's another thing that you can find help with at a bike shop. Best of luck to you!