4ghz/8gb RAM dedicated server + Dolphin with you set of features should take 14K uniques easily. Your site may be a little heavier due to video streaming, so that is where you might need to take a closer look.

I'd recommend upgrading to 7.0.3 as soon as it comes out (likely this week), and if it still goes slow, send a message to me (uno@boonex.com) and we'll have a closer look.