Floor mats: What year is your Taco? I have a set of Husky Floor liners from my 3rd gen 4runner, if your Taco is a 1st gen double cab, they might fit. Otherwise, I have to say I'm happy with the Huskies, although to be fair I've never actually tried the Weather Techs. The Husky floor liners fit decent, though not perfect (but then again, I'm not sure any floor liner fits perfectly.) They do a GREAT job of keeping mud, snow and slush off my carpet, and cleaning is simple.
Seat covers: I'm very happy with the heavy duty cordura covers I got from Marathon Seat Covers. They were pricey (about $250 for the fronts only) but very well made, fit great, and look great. They are also very durable heavy cordura and they were the only company that made covers in the particular camo pattern I wanted (3-color DCU camo.)