Motorola V710

Ok, here's my issue. I don't have that much money to spend and as you guys know the phone is already $249 with the $70 mail-in rebate. I noticed that there are two headsets, the HS810 priced at $99.99 and the HS820 priced at $79.99. I know that the HS810 comes with a Neck Strap, Travel Charger, and Carry Case and that the HS820 just comes with the charger. What I want to know is what's the main difference in between the two that makes one better than the other. Thanks Again guys, and just like the rest of you I can't wait for this phone to be released!