I have the following speakers

NHT 2.5 front L&R
NHT rear L&R HDP1
NHT front center AC1
NHT sub woofer SW2P

Preamps
Analogue preamp: NHT 114
Digital preamp: Sony EP9ES
I've been using NAD 214, NAD 2200, and NAD 216, however it's time to replace them due to attrition. Help! I'm down to three working channels!

Thanks