I have the Sig p226 Stainless Elite and a CZ 75 SP-01 Tactical (so have rubberized grips, 18-round magazines, full frame with rail, decocker and night-sights). Love them both, they both are 'boring' guns to shoot as hitting what you intend is seemingly done with relative ease.
The challenges are few on these pistols. Reliable as all heck, eat anything I have put thru them, nice and 'heavy' so soak up recoil to a point you are almost yawning (mine are 9mm).
The CZ does seem more svelt as the Sig is a blocky hussy in comparison. It's quite obvious when they are held side by side. The quality goes to Sig as the milling inside and out (on mine at least) is flawless. The trigger goes to Sig as I have the SRT trigger and it is superb, the trigger on my CZ is 'good enough' I have no complaints, It's double action on mine has some minor noticeable grit but the larger CZ community speaks of an easy trigger job that can be performed to change its character from a vacation dream to a wet dream. I'm happy enough with the vacation..I'm just not a tedious type of fellow. It's not as good as the sig but it's good and I have no complaints.
The CZ costs significatly less than the sig as you likely know, I dont have the stainless CZ 75B and as I understand they cost about $750 or so, the matte stainless looks particularly awesome. You can get the regular CZ for under $600.
CZ Magazines are akin in price to the Sig Mags..about $50 for factory mags I think, there are Mecgar and Promag alternatives. I have a 31-round Promag extended mag for my CZ sort of as a novelty as many in the CZ community generally do not have the fondest things to say regarding the quality of ProMag Magazines but mine works without issue. My Tactical model comes with the 18-round magazine so I dont recall what the standard magazine for the CZ-75 costs...maybe $40? I dont see myself ever departing with either firearm, they are both awesome, in truth my introverted sensibilities makes the stainless sig seem like an attention ***** and if I were ever to have a safe queen, it would be first in line, the darn thing is too pretty, if I had a stainless CZ it would be close behind the Sig living a life swathed in a silicon imbibed sock tucked away in a velvet lined mahogany box (If such is the life of a safe queen that is..), both look awesome and attention grabbing in stainless.
I've spent some time putting rounds thru both of them when they were new and are both dead on accurate if I do my part and for me I'll trust them to go to war but neither are flawed enough to make them fun at the range once you put a few mags thru them, they are too easy and thus boring so now I don't shoot them as much as they deserve.
you cant go wrong with either, if costs are a concern and you want one now, go with the CZ, a proven 'wonder-nine' just like the P226, then put aside the pennies as best as you can and get the sig later. Sig will keep making them and they will be available when you are ready!