I would second the vote for quick attach backhoe buckets (very easy to swap) and add a 12" trenching bucket to the order. The 12" is the best (IMO) when using the thumb. It's the same width as the thumb and is great for moving small rocks, logs, etc (building rock walls). Plus it's great for digging in really tough ground as you can concentrate the force into 12" area.
Yes, thumb is part of the package.
I have thought about an extra bucket size as it comes with 24". I'll have to ask about the quick attach for the backhoe.
Tomorrow I talk to another dealer to determine whether they will give me a better price. What bugs me is there is a dealer about 7hrs from here advertising a new L45 at $41,900 CAD whereas my local guy is asking $48,500, that is a big difference. I am not sure if the long distance dealer has the thumb on it though as I have heard this is $3-4k.