So I'll assume your a homeowner not in business?
ANyway, then yes, thats all you'll ever need, should outlive you if you treat it right. I've easily put enough commercial hours on a craftsman 5.5 horse self propelled 22" to last you over 100 years at 1 hour a month, and it still ran pretty good, but it was beat up.
TSgt David M. Famiglietti
United States Air Force
EarthWorks Professional Outdoor Services
North Las Vegas, Nevada