There is a certain risk with buying over the internet, but the selection is much greater. Generally speaking, the higher $$ guitars SHOULD have tighter quality control, but it is usually best to get it in your hands before you buy it.
Seagull's are great guitars. I started (and still have) with a used S6 off eBay a year and a half ago. They have a wider fretboard than most (1.8") and a short-scale which keeps the string tension down a bit so it's easier on the fingers. The cedar top dings easily, but the sound is more mellow than spruce. I think it's the best guitar under $500 out there. Best thing, is you won't outgrow it quickly and be on the market again in 9 mo. Find one and play it. Nice balanced sound.
If you are more into bluegrass/country, two other cheaper brands to look for are Blueridge and Carolina (by Johnson).
Good luck.