The last bushwacking tool you will ever need:
http://www.noze-nuz.com/gerber/thinner/1.jpg
Gerber Brush Thinner
The older version with the plastic handle was better, but the new school ones still get the job done.
I've spent probably a grand on hot-shit Ontarios, ESSEs, RATs, Kukris, etc. They all suck.
Short of a full-bore bush-hook/bush-axe that cheap Gerber served me far better than anything I ever tried.
I'd take a Martindale in a pinch, but the fat-assed blades on most machetes is a massive detriment to performance.