Best answer by Mathis
When you're planning to upload many episodes to your podcast, Pro Unlimited is probably what you want to go for actually, but Chris is right - you can definitely start with a free account and see how it works out for you.
It’s important to note that the two subscriptions we now offer are completely separate from each other.
The SoundCloud Pro and Pro Unlimited subscriptions are there for users who want to have more upload time on their accounts, as well as other features such as extended stats information, and the ability to replace files on already uploaded tracks.
The SoundCloud Go subscription is for users who want access to our newly expanded catalog—everything from chart-toppers to underground artists— available offline and ad-free.
If you already have a Pro Unlimited subscription, you have the opportunity to purchase SoundCloud Go at a discounted price through our SoundCloud Go page: http://soundcloud.com/go. Learn more details about the SoundCloud Go discount for Pro Unlimited users: http://payments.help.soundcloud.com/customer/portal/articles/2344051