This isn't a bad low end board. It has the following features:
Key Highlights
Two 10-bit analog outputs
One 32-bit external event counter
External trigger input
12-bit (DI), 11-bit (SE) resolution
8 single-ended or 4 differential analog inputs
16 digital I/O lines
When you start getting into faster scan speeds and higher bits they do get pricey real quick. One feature I like with analog inputs, beyond higher A/D bits is the ability to have differential or single ended inputs. That comes in real handy when you want to measure signals that do not or can not share a common ground.
I guess if someone was real enthusiastic they could roll their own using one of the many micro controllers out there. Maybe some of the other members will have some thoughts or reasonably priced boards to share a little above what you already have.
Ron