Upgrading a Mac Mini

I recently acquired a Mac Mini belonging to my brother after he died. His brother-in-law, a computer programmer, wiped it clean and took it back to factory. I'm confident he did it right. Now I need to bring it up to the highest standard possible. I have already upgraded it to Leopard 10.5.8, from 10.5.4. I don't know the year of this computer. Here is the hardware overview if that would help:

Hardware Overview:

Model Name: Mac mini

Model Identifier: Macmini2,1

Processor Name: Intel Core 2 Duo

Processor Speed: 2 GHz

Number Of Processors: 1

Total Number Of Cores: 2

L2 Cache: 4 MB

Memory: 2 GB

Bus Speed: 667 MHz

Boot ROM Version: MM21.009A.B00

SMC Version (system): 1.19f2

Serial Number (system): YM*******YL4

Hardware UUID: 00000000-0000-1000-8000-001FF346AEAC

What is the highest OS I can upgrade to? Can I do it all at once, or do I have to do it in increments? I would love to take it to Maverick, but wonder if that is possible?

~~Margo

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