Need to buy a good string trimmer

My 10 year old one won't start this morning so I'm looking far a good reliable weed wacker. I need a good quality, perhaps a commercial one as my needs are more than most home owners. 2 cycle or the new 4 cycle, mixing oil is never a problem so what's the deal?
Ttroy-Bilt, Husqvarna, Makita, Tanaka, Echo, Stihl?
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My dad's had 2 Shindaiwas for 19 years or so - has 5 acres on a hill, lots of blackberries. My husband's torn them apart and cleaned everything probably for the 1st time just last fall; they're still going strong. They're pricey, but good commercal-grade machines. Try getting one on eBay, you could get a good deal. For the blackberries, we discovered a metal blackberry blade; works wonders.

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