Update Mac os x v10.7 lion

Well I'm thinking to buy an iMac but not an expensive one.
I have found an iMac with OS X v.10.7 Lion ,with 27" LED-backlit glossy widescreen TFT display
and main memory 4GB DDR2 1333MHz in a good price and eventually I could afford.
But my question is that is it going to be compatible to update to OS X 10.9 Mavericks?
And maybe when Yosemite OS come this fall ,to be compatible with OS X 10.10?

1. All the 27-inch iMacs are compatible with Mavericks.
2. The system requirements for Yosemite aren't publicly available at this time.
(108209)

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    All MacPros.
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    Authored by a brody
     

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