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Hi Ahmed,
I have a 200mm F4 also, and found it great to learn with (and still use).
For the coma corrector you can't go wrong with a Baader MPCC, I used one with an APS-C sized sensor on two cameras and it was an easy setup. I've also have a paracorr now, which seems to be a bit of a step up from the MPCC, but also has a 15% Barlow effect so its F4.6 and ~920mm focal length with it. The paracorr is also quite expensive, and when I was learning I doubt I would have noticed the difference (or set it up properly to begin with).
The 183 will have a different pixel scale to the QHY10 I use now as it has much smaller pixels, there are calculators and tools you can use to visualise different focal lengths and sensor sizes as well as calculate the pixel scale and get an idea if its over or under-sampled. Bintel has one on their site in the tools section. You can see the difference between the MPCC (1.0x) and Paracorr (1.15x) with various sample DSO images.
I have used the L-Pro for a while and its also very good, but I haven't compared to the enhance or extreme.
elliot
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