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G'day Adrian, Why not stay with your ed80? It is a good scope and while not as fast as some larger optical systems it is capable of good things. If you want a longer f ratio, invest in a good powermate or barlow. One thing to keep in mind is that a 150mm Acro is going to set you back 3~4k anyway.
for around 3K you could get yourself a 127mm Meade ED OTA and mount that on your EQ5. If your EQ5 is not a goto model then you could upgrade with the money saved by settling for a 127mm ED. Refocusing for each colour is as has been said practical, but it is also a pain in the thumb. Another thing to consider is that if you do invest in a 300d body, this is a one-shot colour platform and the money spent on filters ans a filter wheel or such will be wasted.
In summary, learn to wring the most out of your ED 80, concentrate on getting something like a canon 300D or 350D body, get that EQ5 upgraded to a Goto if it is not already there.
Then when you have that equipment mastered decide what road into the future you wish to travel.
I can also recommend the Lumicon easy Guider for mounting your web-cam guider.
cheers,
Doug
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