Membership script dilemma

Hi,

So I'm setting up a membership site for a piece of software I'm selling and I was wondering which one I should pick. Each has pros and cons:

- aMember 3.x series

pros: already have the licence and all the plugins, used it on my other websites
cons: outdated

- aMember 4.x series

pros: new look, up to date, etc.
cons: I have to pay a $80 upgrade fee and I'm not sure if I get a whole lot of new features, looks like they just changed the skin? Also is it abandonware? I feel like the development has stopped. Also can't find it on BHW.

- Digital Access Pass

pros: looks pretty good, lots of people are using it
cons: kinda expensive ($197), no free trial available, can't find it on BHW

- something else??

Help me solve my dilemma

http://www.paypalmemberscript.com/

Pros: Cheap
Cons: Nowhere near as many features as the ones you mentioned above

There's no video, no screenshots, no demo, no free trial... so no thanks.

I'm open for simple membership scripts, but I do need it to have affiliate system in it.