yep, don't sandblast if you plan on having good qulaity bodywork done later as the blasting can 'work harden' the sheetmetal that make sit hard to straighten and weld later. The softer media that techinspector1 mentions is the go.

Another option is chemical dipping, although a less than perfect job can result in chemicals oozing out later on and ruining a good paint job.

I spent days and days with stripping wheels on a power drill to strip my car's underside.