Hi Hans,
According to the Moody Boat Archive accessible from the moodyowners.org home page, 253 Eclipse 33s were built, 24 Eclipse 38s and 38 Eclipse 43s. I've rarely seen the larger vessels on sale, partly since there are so few. It seems there were only 4 36DSs built so I doubt you'd find one for sale. They are also 10 years older than the Eclipse series. Personally I think the 33 is the best compromise between space and length in the Eclipse series, but it has a few downsides:
There is nowhere 'good' in the 33 mark 1 to put a microwave oven. Owners have shoehorned one in under or above the chart table, amongst other things. Likewise, there is no space for a separate freezer, which you may want as a liveaboard. The mark 2 without inner helm has more space but you would need to construct some form of housing. The aft cabin is only suitable for one person (in my 6' tall opinion). There is a noticable list to port which you may or may ont be able to live with.
That being said, I had planned on using Jonika as an off-season holiday home after moving further southin the UK, but plans changed significantly on me during the pandemic and I'm now looking forward to getting her back out and away this summer. The interior is almost Tradis-like - there seems to be a lot more space inside than you would expect for a (just under) 33 foot boat. The diesel heater fitted to most is easily capable of keeping the interior at a very pleasing level which would be important for more northerly latitudes.
If I could afford one of the larger Eclipses, I'd definately prefer the 43 as the additional cabin offers much more flexibility for an office space, etc. over the 38. I imagine it would be more stable in a blow while moored as well.