Frequency Synthesis from 1MHz to 800MHz
Texas Instruments has a component that can do the majority of your desired RF output range: LMX2571. At around $12, quantity 1, on Digikey, this will successfully implement 10MHz to >1GHz signal synthesis. It also has an internal VCO, so its output range will not be dependent on an external VCO's frequency range.

Along with a high quality, but not necessarily as high-spec as the AD9910 that you suggested, you could probably cover audio (kHz) to 50MHz effectively for HF radios, then cover 30m/10MHz and higher frequencies with the LMX RF synthesizer.