Recommendations for Resin casting

Hi, Does anyone have any good recommendations for a good resin to use when casting parts?
I'd like to find something that is sandable. Similar to the resin used in Resin figures.
Since I'm in the U.S. My main choices are products by Smooth-on or Silpak.
I have used Smooth-Ons Smooth Cast 300 but it felt a bit to much like soft plastic to me and did not sand very cleanly.
Any suggestions would be appreciated.
Thanks,
Michael

You are in the US, try Aeromarine products, their resin is really good !

I use Vagabond 36xxx from Glenmarc and it sands very easily.

Thanks for the answers. I will look up both suggestions and maybe do a price comparison.
I may ask on the prop builders also and see if they have any suggestions.
Thanks,
Michael