Thanks for the DAC info guys 
I'll go for the MCP4922 first as i can get it cheap from a local shop. I'll keep the LTC2642CMS in mind though and get myself one of these the next time i buy something at farnell.com .
In the meantime i implemented FM Synthesis in addition to wavetable synthesis. I can either use both together (choose wavetables for fm modulator and carrier) or only use wavetables like before. This can be set per Voice, so you don't have to use FM Synthesis for everything if you don't want to.
Next is adding an envelope to both the modulator volume and pitch to get more action in there (i'm currently "emulating" the envelope curves by hand 
)
I'll upload a new sample track of the FM Synthesis stuff once i have the DAC working.
Again, thanks for the help so far!
[edit]
Oh well, i'm having to much fun here
So here's an example of the current status. No DAC yet.