Well, I like your taste in guns. I have the 229 in 9mm, and I have the 239 in 9mm. I actually used to have two of the 229's in 9mm, but I just sold one to finance something a bit different. I'm a big fan of the 229 myself, but I like the 226's too. The difference is not huge. They just have a bit different feel to them.
From what I can tell, the only 229 Elite's we have gotten in Canada have been the blued 9mm's - which is great looking gun in my book. Several of the site sponsors sell them. Sounds like you really want the Stainless Elite in .40 though. I think Questar (and maybe some other dealers) would put that together for you, but it will be prohibitively expensive in a 229 (as you will pretty much be buying a $250+ barrel that you will not be able to have... and you'll be buying another 106mm barrel that you can have). Get one as a 226 then. Definitely the more cost effective way of doing it anyway.
One nice thing about Elite's is they all have the SRT (short reset trigger), which I think is a desirable feature. Since I got my 239 TAC with SRT, I am not that keen on getting any SIG that doesn't have it. Although I will admit, it is not really a better or worse situation, it is what you get used to. You can certainly still rapid-fire double-tap away with the regular DA/SA trigger. For myself I think I would rather get used to SRT than stick with the traditional DA/SA though. It seems a bit nicer.
You can look at the U.S. website topgunsupply for some good pics of these guns. Keep in mind that all the Elites (and these days, I think all new SIGs) are stainless steel slides. Some have the stainless look, some blue/black treatment on them. The frames are all alloy, including on the stainless Elites. Guns with steel frames are around, but not as an "Elite" model. They are called SL's (and a few other things... SA's?)
Both the 226 and 229 are doublestack mags. In the SIG world:
Single-stack: 210, 220, 225, 230, 232, 239, 245, GSR, Mosquito... maybe some others.
Double-stack: 226, 228, 229, 250, SIG Pro
E-mail Questar (or Shooting Edge or P&D or whoever you want to deal with) and get some idea of what it is going to cost to bring in a stainless Elite in .40. I hate to break it to you, but it is probably going to come in at $1,500+ for the 226, $1,800+ for the 229 unless SIG puts some of the stainless Elite .40's together with "Canadian" barrels at the factory. As I say, so far I don't believe they have done this... just regular 229R in 9 or 40, Equinox in .40, Gen 1 SAS in .40, and blued Elite in 9mm.