Originally Posted by digiconvert
Might be new old stock [sticking on a store shelf] but it can't be NEW. They haven't been made for over a year I think. That's about $700 US I guess? If it's really in like new condition it's an okay price.
The ETRSI is going to be the newest of the choices you have. It'll have the best feature set if that matters. If you don't need 6x6 I'd go for the ETRSI. If you do I'd ask about a SQAI.
Read the manual.
I'd suggest seeing if you can try them out. Alot depends on how things feel to you.