Mounted Combat build

[Flatus Maximus]

Be a gnome! The trip attack on a ridding dog and that sticking your lance in the prone monster, is great. Just ready an attack on everything that comes at you and trip away. Great fun!

Zanticor

Seconded. If you're Small and your mount is Medium, you can go wherever the other Medium characters can go. The damage dice are smaller, but you'll be charging, Power Attacking, etc. Plus, find a Medium burrowing mammal mount (wolverine?) for some gnome-flavor synergy.

 

[Darklone]

Bard paladin is great because with maxxed Inspire you can go Power Attacking and keep up with other bashers for damage output.