Ask HN: In the beginning, should I improve growth or improve the experience?

Hey guys. Last week I launched a side-project called makeitpersonal (http://makeitpersonal.co). My expectations were pretty low (10 people using the site was my bar for success) but it turns out that there is a a decent amount of people who want something like this.

I decided to spend a bit more time working on this and now I have a bunch of features that I'd like to implement. They can be divided into two groups:

1. Features that will attract more users. Stuff like sharing on social networks, an improved landing page and alerts for first-time visitors, etc.

2. Features that will make the system more "complete" and useful for the current users. Stuff like a WYSIWYG editor instead of Markdown, discoverability of other users, etc.

I don't know where this will lead yet, but if you were given a choice like this one, would you focus your attention on getting new users or on improving the experience of the existing ones?