Yeah, a Torpedo will work, and work decently well for a long time, but by far the two regulators I have loved are my old school Sidewinder (the one that doesn't look like a bong) and my Palmer's. I sold my Palmer's long ago as I don't use CO2 at all anymore, and still miss it. The Sidewinder is HPA only as far as I'm concerned. You can always keep the regulator for other markers, and Palmer's hold their value pretty well due to their reputation and quality.
Try looking on the used market, a Palmer's should be around $70-80 shipped to your door. They're near indestructible, so I wouldn't think twice about buying one used VS new except if it looked like it had been hit by a freight train.