The HP 500c is just a larger version of a desktop inkjet printer.  If you print something with it and hang it/use it outside it will be faded out to nothing in a few weeks/months.  So no, it would not be a choice for banners or car wraps.  For those items you more than likely want a solvent, mild-solvent or eco-solvent based printer.  
Average cost for a new eco-solvent printer is around $12-30,000.00 then you need a RIP to drive the printer...$2,500+, a cutter/plotter if you want to die-cut things like decals or custom shapes etc...$3,000+ and then finally a laminator $2000-$5000.  Very easy to have a minimum of $20k+ invested just to get started...