If you buy or rent a chainsaw be sure to also get the full safety equipment and proper instruction. I have seen the damage a chainsaw can to to the body and have been saved in the past by wearing the proper gear.

Since you have a woodlot to manage I would suggest you buy a good saw, a Husqvarna or Stihl would make a great Fathers Day gift (or for Mothers Day if your wife is really understanding)?

Mike