The Puma, fully up armoured, weighs 42 tonnes with it's current armoured configuration. While a Leo 2 weighs 70-110 tonnes uparmoured (+/- a lot, depending on armour used, attachments, etc), the Puma actually has better battlefield manoeuvrability, with approximately half the frontal arc protection of a Leopard 2A6M Can, and many times the mine/IED protection factor.
The VBCI (correction on my earlier name), doesn't have the same levels of protection as the Puma, is easier to spot in a combat zone, and while it travels faster on road and has better maintenance cycle than tracked vehicles, it has dismal off road performance.
Another interesting one, which I don't think is even being looked at, is the Isreali Namer:
http://en.wikipedia.org/wiki/Namer_(vehicle)It doesn't really fit the medium weight roll though, being 60 tonnes with base level armour, same as a Leopard2.
I know about the mobility tests of the LAV 25 and LAV 3.
As an armoured guy, I have a personal favourite, but what they get is what they get, if they get anything at all.
Now, if they botch the new recce vehicle purchase, I'm gonna be pissed.