Only 2 GB of RAM? I was about to go on a rant about 945GM supporting 4 GB and that Apple is ridiculous for breaking Intel's already crippled legs, but it looks like you can get those mac minis to 4 GB of RAM by modifying the EFI so they accept 2 GB SODIMMs.
Honestly Intel was so stupid to limit memory on their mobile platforms over and over, ugh!
It's probably worth it if that machine sees enough use. Be advised Core 2 Duos output more heat than Core Duos and aren't actually faster aside from supporting 64-bit instruction sets. I don't believe a Core 2 Duo would be necessary for the 4 GB RAM mod (because I don't see any reason why that would be), but I haven't done the mod so don't quote me.