I've tried almost all of the available options and none of them were quite right for me. It probably isn't the prettiest option, but I find it to be easier to use and it's not missing and functionality (like voting and commenting).

It's a Universal iPhone/iPad app so you get it on both. It has a simple tab method to go back and forth quickly between the HN discussion and the article. You can share from email or on Twitter, and it has support for adding articles to Instapaper.

I'll leave a clickable link in the comments, as well as a few Promo Codes.