$369 for a rail/shoulder system seems reasonable to me and indie has a good reputation for entry level gear. Not sure what you expect it to do, but I think for the price it will work just fine.
Another alternative is CAVISION's system which is also reasonably priced: http://www.bhphotovideo.com/c/search?Ntt=cavision+shoulder&N=0&InitialSearch=yes
If you want to step it up and be the envy of all those film school students then drop the coin for a zacuto system.
DIY - (also check dvxuser.com as I recall seeing some homemade mounts in their DIY section)
And finally one last idea...