BloomBikeShop

The CycleOps Fluid 2 and the Kurt Kinetic Road Machine still seem to be the two standouts in this price range (just under $300). They've proven themselves time and again.

Like rubiksoval, I personally prefer rollers, but there are pros and cons (which I've written about before). Rollers might come in under your budget, and they're quite fun, very similar to riding outdoors, but require your full attention and don't pair as easily to Zwift.