What is your local mountain, I'm assuming Bear or mt High? That would mostly rule out Big Mountain stuff.
You will know very quickly when your board starts holding you back. Runs here are short so if you are like me you will get bored of just cruising down the mountain and look into jumping off stuff even little things. Id start thinking of all mountain freestyle decks. stuff that handles cruising perfectly fine, can handle speed, and can still mess around when you want to. NS SL, Arbor coda, stuff like that.
You will benefit from a great board when the old one sucks. After one season on a Technine Split T, I felt I needed an upgrade, I got an SL and never looked back. The SL Is very damp and you can go fast comfortably if that's your thing.
Yep mt high is where I will be spending most of my time, I plan to get there at least twice a week. I checked out the SL, sick looking board. Maybe I will hold out until the end of season or find a demo day to see if I'm ready for a new board yet.