Agree with the Becker Patrol Machete recommendation... they are about $65 if I recall. Think it may still be called "Bush Hog" at some retailers, but has changed names. Good overall design, from blade to handle.
I also have these:
12" Ontario plain handle
18" Ontario D-Guard
22" Ontario plain handle
All are good utility pieces for the money.
12" is too short to really be called a machete, it's a big knife made from thin stock. I find it useful around the yard, but it isn't what I'd take along to clear a trail.
The 18" is about right. I liked the D-guard at first, but under heavy use it started to really beat the starch out of my little finger...bad bruise, much pain but had to keep working on building that trail. And one of the three "rivets" or whatever they use to attach the handle has loosened up. It is a $24 item though.
The 22" Ontario is noticeably heavier than the 18", and that can be good or bad. Good in that it'll whack deeper into hard/tough stuff. But heavy is heavy.
I think I'd get the 18" without the D-Guard as a 1st purchase. Price is right.