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[Mike-fish]

if i were to start with the RKL and down the road want to up grade to the RKE would all the addons still work fine

[gregzz4]

Originally Posted by Mike-fish

if i were to start with the RKL and down the road want to up grade to the RKE would all the addons still work fine

Mostly, except for the iTemp, which comes with all RKLs, and what I mention near the end.
The RKE comes with a different probe, just called Temp, that has a different connector.
The RKE can also use the newer SL2 while the RKL can only use the SL1.
The SL1 is compatible with both and has connections for 2 switches, a Temp probe and an ORP probe, plus 2 com connectors.
The SL2 has removed the OPR port and replaced it with a Salinity port.

You should double-check on the DA site though as I am not 100% sure about the Advanced Light controller, and I believe the Net module only works on the RKE.
Sorry if I missed anything. I'm still new to these controllers.