So last week I picked up a Wacom Intuos S pen tablet. This is their smallest (and cheapest) tablet, at around US$70. It is connected via USB, with a BlueTooth version available for about $10 more, and a larger version (the M) for about $200.
As I am not an artist, I thought the smaller one would be fine for my intended usage, which is a pen interface for better control over selections and brushing, and pressure sensitivity for variable flow with dodging/burning and masking overlays and adjustment layers.
For such a minimal outlay of cash, it has exceeded my expectations by an order of magnitude. The software has come a long way since I last worked with a Wacom device, and is configurable in a myriad of ways on a per program basis.
There are plenty of reviews online so I won't go into any more detail (unless any of you have questions). Suffice it to say it has significantly increased my productivity in post, and if you're still mousing around with selection and brush tools it is definitely worth a look.