I have the GNexus. What does that mean by poor radio? You may be right, but I just don't know what you mean. Mine works pretty well for 1.5 years, but I am in the DC market, so maybe because I am in a big market?
I have the Galaxy Nexus, I like it and its pure Google. Clearly older than the S3, but based on what you are saying, if price is a question, go for it.
I have two that I use regulary.
Spektrum which was $5 at Five Below:
Spektrum Stylus & Ink Pen Review - YouTube
Also the Motorola Xoom Active Stylus:
Review Motorola Xoom 2 Xyboard Active Stylus 10.1 - YouTube