I considered monthly subscription and want to offer it in the long run. Recurly looks like the best solution out there, but it's also pricey when you're starting out and want to keep costs low.
I really went with the most simple solution I could come up with, which is one price point and Harvest+PayPal as a super cheap payment solution that does not require payment gateway and merchant account.
Also, I realize you're keeping it simple now but have you thought about figuring out scarce resources (likely bandwidth) and charging based on that? Or, even just setting a threshold at which there will be extra charges. (1GB traffic/day or 2GBs stored.)
When I see a company offer unlimited deals I wonder how long they'll be able to offer that.
Looks neat, if I had a product being released it's stuff I know I wouldn't be as on the ball with as you now are. I'll sign up (even at current prices) if I release anything.
Even though an EA division would pay as much as an indie, I think the pricing is still very fair with effectively being less then 9 EUR / month and with the fact that I don't charge people if they don't want to renew after one year, but still keep the existent data.