Well, the Super Ikonta goes for about three times the price as a Nettar in equally good shape - if you have to have it CLA'd anyway, it makes sense to buy the more expensive camera in the first place, because it's more worth the extra money you put in to get it working perfectly. There *are* people in North America who do these jobs - I'm not aware of anyone in Canada, but a good service provides you with a fully working camera for years to come! If everything else fails, check out
Certo6 – Vintage Folding Cameras <- Jurgen is renowned for the quality of his work.
Anyway, I have to say that in spite of the praise I read for earlier models (which made me buy one - the 532/16, the grandmother of the 531/16 - yes, it's confusing), I'm really pleased with the 531/16. Specifically, I'm actually quite happy with the configuration and quality of the Synchro Compur in my camera - it's in rather good condition, not as dried up as others I've used, and it's not EV based (so it doesn't have coupled shutter/aperture controls - which only makes sense with a built-in lightmeter, I guess).
The Nettars have one thing going for them: The Pronto (cheapo - 1/25 to 1/200) or Prontor shutters most of them use are ridiculously reliable compared to the more sophisticated, but also more delicate Compur models; the Novar Anastigmat lenses you usually get are softer than the Tessars, but still quite nice, and with a distinct rendering that can be very pleasing. So if you find a Nettar in good working order and don't have to pay a lot, they can make wonderful companion cameras you don't have to worry about (much). I have a couple, and even the post-war 515/2 in the second cheapest configuration (three-speed Vario shutter, f/6.3 Novar lens) is a fun tool - in good light, that is.
But I would actually advise against Tessar Nettars - it's a bit counter-intuitive to get a famously sharp lens, yet to have to guess the focus distance. Better go all in in this case and get a Super Ikonta; from the 530 onwards, they're desirable cameras, each with its own strengths and weaknesses. The models I'd go for are (in descending order) the 531/16, the 534/16 (with built-in meter - failure-prone, but glorious if you get a working one and can live with the coupled settings) and the almighty 532/16 - the latter is over-engineered to the point of becoming a little cumbersome, but it's enormously impressive and built like a tank.
M.