oracal does make an intermediate grade vinyl - and a lot of sign people use it successfully - it's not my favorite, especially this grade. i used a boatload of it for a job a few years back and the adhesive wasn't stable.....it goo-ed (how's that for technical terms
) all over my plotter and blade.....i was not a happy camper! i far prefer mac-tac and have used it almost exclusively for almost 10 years without a single vinyl failure. whatever you do, stay far, far away from avery....
FDC also makes a decent grade of intermediate use vinyl, but a bit pricey for your current needs. 3M is good stuff, but imho, have priced themselves out of the market over the years.