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I've used Ventrilo in the past, quite a bit actually. It's certainly more expensive than Teamspeak, but we never had any complaints with it.
Mind you, it's been awhile since I last used it. Might be worth looking at though.
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Vent(rilo) is okay, and usually the more favored of the voice programs, as TS2 are sometime more expensive as well, but with TS2 you pay for quality... I'm currently using a 14man server off jolt.co.uk which costs me about 20 quid for 3 or 4 months.
If anyone needs help setting up a ts2 server once they've got one, just gimme a shout, its simple and can be done easily in like 10mins... but dont ask me about vent as I wouldn't have a scooby