I'm rocking the Yuasa HotShot Yuasa Hotshot Automatic Motorcycle Battery Charger
seems to be comparable to the Battery Tender Jr. its done me well for 3 winters so far doing 3 of my own batteries and a couple for friends. even used it on my car battery before when it got extremely cold here and it didn't wanna start most days (my commute was only about 3 miles so it didn't charge the battery very good). it'll probably resume duty next week.
I went a different and less expensive route. A Schumaker SEM_1562A Battery Companion. It works just like a Tender but I found it at Wallyworld (the evil retailer) for $17. It has a quick connect like the Tender and does a great job. Here's some linkage SEM-1562A - 1.5 amp Battery Companion®