Best members-only content plug-in?

Hello,

I’m getting ready to transfer my blog from pMachine 2.3 to WordPress.

On my current pMachine blog, I 2 separate blogs set up – the regular one which anyone can see upon visiting my site, and also a separate “secret blog” which is only viewable by a select group of members.

I would like to continue writing “secret” content that only members can see. I’m hoping that with WordPress I can integrate those private entries into my main blog.

So basically what I want are 3 “levels” of access:

1. Casual non-subscribed visitors – They can view non-private entries, but not comment on them.

2. “Subscribers” – they can view the regular blog entries, and comment on them. I want to require users to subscribe in order to comment as a means of preventing spammers.

3. “Members” – These are subscribers who are given the extra permission to view my “secret” blog entries.

I know there are WP plug-ins which will allow me to manage my content this way, but I was hoping someone might be able to point me in the direction of the most popular member content plug-in(s) that will suit my needs best.

Also – as a separate question… has anyone come up with a way to import pMachine 2.3 entries into WP 2.0.5? I’ve done a lot of searching here but the postings I’ve found seem to be inconclusive.

Thanks in advance!