Enamel on Acrylic, Acrylic on Enamel, Laquer on ??

Way back when I painted a 1:1 circle track car ('78 Monte Carlo, a future 1:25 project) and inadvertandly used Laquer on top of enamel, which made for a really effective paint stripper.  I am working on a 1:35 M151, which I started painting with Tamiya Acrylic with a brush. Unsatisfied with the results, I sealed the model with acrylic sealer, and overpainted with Testors (ok, Model Masters) spray enamel. So far, it looks A-Ok. Can I now seal this with the acrylic sealer and weather with acrylic's? Or, should I stick with enamels now? I do not have a AB yet, so if I'm going to coat with Future, it will be by brush.

Speaking of AB's (nice segue, eh?) I have it down to either a Badger 200 or an Iwata Revolution SAR; both internal mix single-action. The Badger comes in a small-cup gravity (200-G) or a siphon feed (200-20), while the SAR only comes siphon feed. If you only had ONE AB, which would you choose?

Thanks, Ken