My DD is 20 months and I'm planning on toilet training this summer, when she is 25-26 months old.

There are SO many types of potties and toilet training seats out there, I'm not sure what to buy!

Should I start off with an ordinary potty, or is it best to go straight to a padded toilet training seat (that sits over the loo)?
Are there any particular brands or models that you recommend?
Are some potties better than others? What should I look for?

(My daughter is a bit of a climber, so right now I can see her wanting to stand ON TOP of the toilet! Hopefully she outgrows this climbing obsession soon!)