Unless you're willing to purchase used equipment, most pre/pros are quite a bit more expensive than the ones you mention. You'll have to decide if their additional features are worth the additional cost.
Preamp/processors tend to be more expensive than the equivalent receiver just because of the savings due to manufacturing large numbers of identical items. Far more AVRs are made than pre/pros. An exception is the 2014 Marantz AV7702 pre/pro, which (in the US) has a list price of $2K, which is identical to the US list price of the equivalent SR7009 receiver. (This a strange anomaly: the SR7009 is significantly cheaper in European markets.)
Marantz SR7009+MM9000/Atmos 7.1.4 (FH+TM:DefTech PM1000)/LCR+TM amped