I'm very happy to see the progress. Nice work. I also have an update too.
I purchased the $500 design kit from Microtune. It has the TEF6892 (it has RDS demodulation and preprocessing, this means the decoded RDS data is placed on the I2C bus, so MUCH less code is required), a BTL audio amp, and two regulators. It's outputs are RDS MPX, FM MPX, AM AF, LEVEL (a DC level based on signal strength), antenna input, and 4 audio outputs from the TEF6892 as well as amplified audio outputs from the amp. I honestly love this damn thing. The software that came with it was the control software for the tuner and the TEF6892. Philips was kind enough to send me RDS reader and decoder software that has support for the TEF6892 and the SAA6588 as well. It reads the RDS data on the I2C bus and displays it. I'm including a pic of all the software running.
The antenna I made is a 50 ohm RG-174 coax with SMB connector that plugs unto the SMB jack on the design kit, The end of it is connected to a dipole I made. I get decent reception, but I think the wallwort power supply I'm using adds noise that hinders reception.
As for my own design, I'm going to build the hardware first and control everything with a PC for the time being. This way I'll be able to evaluate the MPX, RDS, and AM stereo decoders I want to use. I'm still quite undecided of what audio processor to use, but I'm leaning towards the TEF6892. If I use it I eliminate the need for an MPX and RDS decoder. With the TEF6892 I also get RDS and MPX gain which helps in reception a great deal. But there is no audio processor with an AM stereo decoder, unfortonately, so I'll have to use a seperate one, either based on the MC13022 or MC13028. I really did want to use the SAA6588 for RDS/RBDS decoding, but also wanted to build a SAA6581 PCB for RDS clock and data output so I could use better software than the Philips stuff. Another advantage to the TEF6892 is the fact I can use the frequency output from the tuner, and not depend on an RDS crystal. I'm just going to use everything and going to see what works best for me. Once all that is done, the hard part starts--the software. I can barely do 8051 ASM, but I think PIC ASM would be a bit easier. I still need to get a hold of the OLED display as well. I never had to sign an NDA for the design kit, so I think I can distribute the TEF and tuner software.