If you like the 243 ,I would get it.I haven't used a 243 for deer in several years but have took quit a few with one out to 300 yds,never had to shoot one more than once and never lost one.
I still shoot it at the range pretty often and it does well on paper too.
The 308,260 and 7/08 is a great deer rifles too.I have all three and they are fun to shoot and all will take deer.