I can suggest a couple of traditionals based on my experience, but your intended use will determine which blade is best for you.
A good sod buster is always handy for gardening or field work, and a stainless steel blade or a coated (Teflon or backed on finish) makes life much easier. You can get a wide range of quality and prices from many manufacturers, so I won't suggest a specific brand. This is a basic all around knife.
If you're going to work mostly with plants and trees, a pruner is a good choice. These have a blade shape similar to a hawksbill, but with a less pronounced tip (or "beak). I've used a Victorinox, which is excellent although the stainless steel blade is a bit thin, along with a pair of A. Wright & Sons models (from Shefield, England). One is a fancier high carbon stainless with horn scales, and the other is a carbon steel workhorse with wooden scales and wider blade, which rusts if not maintained constantly, but is a great cutter. My favorite is an all stainless Rodgers, also from Sheffield, that is very slim but sturdy, and great for carrying when no work is planned but is possible. I also have a Schrade beater with white plastic scales and stainless steel sheepsfoot blade, which I've learned to appreciate and trust for general work.
For cutting fruit and special pruning, I have a Mercury Inox (stainless) with wood scales and a scythe-like blade, made in Maniago, Italy, which is an awesome cutter and the best thing for cutting down everything from papayas and mangos to coconuts, not to mention oranges and grapefruits.
For very heavy cutting a hawksbill is probably your best choice. I have a Sheffield Mfg. model with stainless lock blade and wood scales that is quite a brute handling tough jobs, and a Smith & Wesson that is less sturdy but quite useful and less valuable in case of breakage or loss, which can happen if your garden is like mine (tropical semi-jungle).
I hope this helps in some way to guide your search and next purchase.