Just ask Shine his "opinion" on sand.
Which I have to agree on.It's "old tech" and a health hazard besides applying a larger than necessary anchor pattern.
There are plenty of "safer" blasting medias available and most times,it comes down to what you can get localy because you can purchase most anything BUT the shiping is what breaks the deal unless of course your buying pallet loads.
Most are using the coal slag type product for blasting in general,especally where rust removal is involved.
If you have a Tractor Supply close,They carry Black Diamond media in 2 grit sizes,Coarse and Fine.
I use the Fine as it's the equivlant of 80gt and can be recycled as long as your not blasting greasy,contaminated areas or parts and does a great job for general work.If you plan on doing heavy equipment or thick structural pieces,the Coarse would be a better choice.
Initally,it is large particles but as you blast,it breaks down and actually does a better job on rust and especally pits.
Starblast is another good media but it's not generally available localy,Just have to check around and see.
As everybody has said,it's the operator and psi used that causes most warpage.Sand especally is a problem as your pounding the metal with tiny hammers and actually stretching the metal as if you were using a hammer & dolly.
I use blasting for most everything but "skin" type panels such as doors,hoods,tops,etc.Any large flat panels with thin metal should be sanded or stripped.
With your set up,you can really "get it on" and basically use the LEAST amount of psi necessary to remove what your working with.Nozzle size will just determine how much area you can do with what air supply you have,Most of us have smaller pumps and use a small nozzle to keep the psi up and removal is slow.With yours,you can use a larger nozzle and cover a larger area faster but you'll use media quicker so it's a trade off for efficiency vs speed.The pro's have either a booth with a floor sump to recycle back in the system or a big butt hopper to dump in 100's of pounds at a time with a very large nozzle to knock it out fast.
Paint removal is "easy" and requires as little as 40# or so but rust,especally pits,requires more psi,and that will be a "feel" thing reguarding the media used,generally 90 or less.