I've sold (I am a salesman but I no longer sell that brand and thus have not vested interest) Tuff Spas in the past and the cover was outstanding (and very light). Additionally, and more importantly, the tub was ergonomically comfortable (but that is completely a personal opinion as we are two totally different people). They use Balboa controls and Waterway motors/jets, and they are the generic versions so the replacement parts are affordable and easily obtainable.
Your 4 big makers of Rotomold are Dream Maker, Strong Spas, FreeFlow, and Tuff Spas. Those are kinda your best options. Find out what is close to you dealer-wise and go from there. Good Luck!