Need Advice About Repairs

I have a 2005 prius with 180,000 miles. The car needs repairs to the water pump (failing), the brakes, and ac unit. The dealership said this would cost around $1450. There are also some other things that will need to be fixed soon along with getting a new electric battery sometime because mine was recharged and estimated to last until around this time. I am trying to decide if it is worth it to get these things fixed even though it will be expensive or more worth it to purchase an entire new prius. The other Prius I am looking at is a 2011 prius with 110,000 miles for $9,000. I am assuming this new prius will also need am electric battery replacement soon as well but I am not 100% sure. The trouble I am having is that I feel like if the 2005 prius will last a long time after these replacements it will be more worth to just get these repaired because eventually these same problems will occur in the 2011. Please if someone could give me advice it would be greatly appreciated as I don't want to spend $9,000 just to have these same issues in 70,000 miles or sooner. Pretty much will the 2005 prius after repairs last longer than the 2011 will before I need these same repairs. If the 2005 will go more miles after everything is repaired then it seems to make more sense to keep that one. Thanks for any advice or help.