Had been out on a business trip and only now got in touch with datatec after they tried to reach me.
I'm sure it caused them quite some headache to find a way to turn the thing so they don't have to sell me the base version for 1000EUR plus VAT. The "Options" for the base version weren't listed on their page at the time I placed my order. In general, it doesn't make any sense to sell a "base model" at all if a "base model option" also needs to be purchased.
Anyway, I never expected to actually receive the instrument, this way the order will be cancelled and the pre-payment returned. Datatec is a reputable company and they value customer service, otherwise I wouldn't have tried this "experimental" purchase with them right from the start...
At least the friendly lady I talked to at the phone admitted that the online offer was a little ambiguous and that they added the "clarification" after my order and apologized for the mis-information.
So I guess I've got to stay with my DIY repaired, second hand, slightly out of calibration SM300 "better then nothing" RF generator