Jevs,
Where are you located? You might find a local digital club which would help you look at options.
Do you have a track layout, are you using any track design software?
Pit-pro and pb-pro are two different things, if you have the new 6 car APB there are options available but pb-pro is not one of them
I've just started using the APB for a small home track, upgraded to the latest firmware. I use SSDC, although there are still a few teething problems Andy is still working on.
If you need more power I know Riko can perform an upgrade to allow more amps.
You will also need a USB cable to connect which both Riko and Rich G sell.
If your looking for pit scenery and don't want to make it yourself I about the Carrera puts as they are well made and are plastic, not card.
Are you doing a full scenery layout?
If you provide you available space dimensions there are some guys in here that like nothing more than deigning tracks.