I hate to be a spoil sport, but I have to lead with my strengths.
With all the eharmony ads and such roaming around, it is easy to get “worked up” over the thought of meeting your soul-mate on something as impersonal as an online dating thingy. I knew a couple that had an online relationship for YEARS, they met frequently, but when one actually moved across the country, their relationship fell apart. Then again, I met my husband online a million years ago. We met on a local BBS. However, we took our relationship OFFLINE very quickly and I do think that contributed to us lasting. 13 years and still going.
My real caution for you is that there are guys out there who KNOW you are looking for the ONE. They have been online long enough to know the drill. Heck, before I met my husband, I went out/talked to a guy who had his schtick down pat. Be wary of too much too soon because it may just be a line. The perception is still that online dating=desperation and therefore, you are an easy target.
Then again, most men know the M/F ratio on those sites is abysmal. So maybe they are just leading with their big guns blazing.
Either way, good luck.