For odd shapes, like your horseshoes, sandblasting is best. The cabinet is really the best for anything that will fit inside. The pressure pots or small hand held guns waste sand since it flies all over the place and is a mess to clean up.
Something to keep in mind. Pre-clean the item of loose material, soil, etc.. This prevents premature contamination of your blast media.
I strongly recommend purchasing sandblast media that it intended for sandblasting, not the "sand box" sand sold at HD. This stuff is silica sand and breaks down into hameful dist. Silica sand is not suppose to be used in commercial sandblasting because of the health effects and may be prohibited my state regulations.
I use alum. oxide or glass beads for fine work and copper slag ("Black Beauty") for course work. I also like to use crushed walnut shells but I recently tried some in my HF cabinet and it clogged up the pick up tube. Not sure why, but I suspect it has absorbed moisture over the couple years it sat in the shed.
The $135 for the the cabinet will just be the beginning. You will eventually want to install a dust collector. This will remove the dust from the cabinet and allow you to continue to use your blast media longer. The media will break down in a short period of time and eventually you will have to dump it and replace it with new. I don't like to just add new media to old since a lot of the old is just too small to be effective anymore.
My opinion FWIW.
Steve