I have the 2 at a time plan. The likelihood of you getting new releases within a month, especially on a one a time plan, is essentially 0. You will probably luck into getting a few relatively early on, but it is not terribly common.
I assume you know not to pay full price right? You can buy gift certificates and the cost is only ~12 a month for 2 at a time that way. You have to buy in a 3 month block though. The 1 at a time is like $9 I think.
If you haven't been a member before, I could send you a referral. I think we both get a free month that way. If you are interested, send me a PM with an email to send it to.