Well, it's hardly a 'collection' - more of a group, really. But I'm fussy and don't jump on every bat that's going cheap.
Ideally, I'd like one nice-looking bat from brands I like. As you see, I've a way to go. But therein lies the fun!
They're all around 2.9/2.10 and have counterbalanced handles, except the Mjolnir, which is a wand at just under 2.8 and doesn't need a counterbalance.
From left to right:
B3 Crown custom (match bat)
B3 wet weather/net bat (copy of match bat)
GM Aura Original (new and unused)
Woodstock Tour de Force XL Players LE
Newbery Mjolnir SPS ( my old match bat, recently refurbed in Cadbury livery)