I'd put the boat at $300, the Werner at $75-100, the skirt at $40, and depends on the helmet. Does it have major visible scratches or dings? Toss it.
Light scratches, no dings, and fits? $20 for a Protec up to $100-ish for a nicer glass helmet. $50 for a WRSI.
Are you a larger person? I'm 6'-6" and 185#. The Agent 6.4 fits my 36-38" inseam and size 14's...just barely. It's a WIDE boat.
Based on the fact you're asking, I assume you haven't been through a lot of playboats. The Agent is a good boat, but not a great boat. I do pretty well with it, but it's edgy compared to the old WS Big EZ that it replaced.
The Rx or a Jackson Super Fun would be better ones to watch for...
It would be a good boat to get started playboating if you need