So I want to get started riding paved trails and commuting from time to time. I can't see getting started with some of the insanely priced bikes. Can you offer some advice in spending somewhere in the 300-400 range? I'd look to upgrade in a year or two if I really got into it. Thanks for any help.

Welcome to BikeForums!

Try searching your local Craig's List for used bikes. You should be able to fine something really decent for 300-400 bucks.
I got my bike off CL it was $160 and it rides great.

Howdy and welcome to the forums! CL or Ebay, even the off the self models from the chain stores would work for ya. Once you know if you like riding, getting a bike fitted from a LBS it will blow your mind in the difference in feel and ride.

Look out for overpriced box store bikes. An older, gently treated mountain bike makes for a good 'allrounder' ride, strong 26" wheels, 18-27 speed, the ability to put racks on for your commuting, (unless you like backpacks). You can gain road speed by changing to narrower tires, stay dry by adding fenders. Stay away from suspension till you decide on Downhill riding, bike paths and commuting don't really need it. Much as this sounds like abuse of LBS, try a few $$$ bikes out till you get a rough idea of the size you need. Not much causes more agony and abandoned bikes than one that does not fit you.