Can't upload my '08 keynote presentations to my iPad 2 '09.

I have multiple talks that I've made using my MacBook 2006 running snow leopards and keynote '08. I would like to have my presentations on my iPad 2 for several reasons - it's easier to carry around my iPad 2 and the talks are more accessible on the iPad; they open more quickly.

I've connected my iPad to my MacBook and added the talks under apps successfully, but when I go to the iPad Keynote app to copy the presentation from iTunes, it starts to download, but then I get a message stating that only presentations saved in iWork '09 can be imported. Now here's the rub. I decide to update keynote '08 on my MacBook to '09 by going to the App Store, but when I try to purchase the new app, I get a message stating that keynote '09 is only compatible with Mac OS X 10.7 aka lion. Ok. I go to download lion, which I learn has been updated to mountain lion (I know I'm a little behind, but I really use my iPad 2 more now), so I go to download mountain lion, but I get a message that it's not compatible with my MacBook. It's compatible with MacBooks made post 2007. So, I've actually been contemplating buying a new MacBook, but as mentioned, I really want to use my iPad more. The main reason to buy a new MacBook would be to be able to use keynote '09 so I can save my keynote '08 talks in keynote '09 so I can get it onto my iPad 2, which would then negate the need for a MacBook. WHAT SHOULD I DO!