reven: i would say, try without a static ip (if you dont already have one) and if it becomes a hassle, spend the extra $5 or so a month to get a static ip address.
$5? What ISP are you with. Vodafone's static IP is $20!
If you happen to be with Vodafone you'll need to request a static IP that's not behind their transparent proxy, otherwise it won't work.