A 180cm boils down to this:
142606 DN Install Kit 25.00 25.00 FS6D 180cm Fortec Dish 175.00 175.00 Collar for C-Band Dish 20.00 20.00 FSKU-4v with dish purchase 35.00 35.00 MercuryII 169.00 169.00 HARL-3624 Super PowerJack Actuator 59.00 59.00Pole / mount = $69.00
Total = $548.00 + shipping

This has 4 lnb not sure if a special bracket / fitting will be needed to mount them ?? / missing parts ??

The 240cm boils down to this:
142606 DN Install Kit 25.00 25.00 Collar for C-Band Dish 20.00 20.00 HARL-3624 Super PowerJack Actuator 59.00 59.00 (CLASSIC,FC08,BSC621-2)C1 FTA C-Band Satellite System 399.00 399.00 MercuryII receiver upgrade to system 40.00 40.00Pole / mount = $69.00
Total = $607.00 + shipping

Not sure if there is parts I am missing.

Looked at doing 2x 100cm or 2x 120cm with 2 classic receivers but for the 2x120cm and quad lnb's = $951
142606 DN Install Kit 25.00 50.00 (CLASSIC,SG2100,DISH,ULN1)M1 FTA Motorized Satellite System 229.00 458.00 HH120 Motor upgrade 69.00 138.00 120CM Dish Upgrade with system purchase 130.00 260.00 FSKU-4v Upgrade with system purchase 25.00 50.00

Suggestions / comments /advice = welcome

Likely I would be better of getting a big dish and adding another receiver later.