Since you stated you want a dealer to setup for you, what do your local dealers sell? If all that you listed are available, I'd probably go with the Serac also if funds allow.
If you can't afford the Serac, I highly recommend the Diva II. I own one and there is nothing to setting it up. I bought mine through Music Direct and their prices are negotiable and they will set it up for you if you buy your cartridge from them.
The Jelco arm that comes with the Avid is quite good too, or you can order it without the arm and have them set up the arm of your choice.
If you can't afford the Serac, I highly recommend the Diva II. I own one and there is nothing to setting it up. I bought mine through Music Direct and their prices are negotiable and they will set it up for you if you buy your cartridge from them.
The Jelco arm that comes with the Avid is quite good too, or you can order it without the arm and have them set up the arm of your choice.