I Need help!! Which race for my 1st IM????

A few things that factored into my decision were:
1.  driving distance (vs. flying) b/c i wanted to be able to train the course
2.  crowd support at the race
3.  enough time to get the training in.  I have family in CDA, but I was nervous about it being too early and not getting enough bike time in (b/c i'm a wuss and don't like to bike outside in the cold all winter!). 

I just got back from CdA.  It's a great place to race. 

There is the logistics of getting to/from the race.  CdA is a long way from anywhere besides Spokane.  St. George might be easier to get to/from being relatively close to Las Vegas. 

Which is more likely to have what you consider "good" race weather?  I can't see signing up for IMKY even though it is 300 miles (instead of 2000) away because Louisville at the end of August is HOT and HUMID (I know, nothing like Louisiana or South Carolina hot and humid).  CdA does give you your best chance at a "daylight finish" since it's fairly far North and right around the Summer Solstice.  I finished at 8:38 PM, and we still had an hour of daylight left (although it was overcast). 

Which has bike/run courses that align with your temperment?  If you want a pancake-flat bike, then skip CdA, it's fairly technical.  Don't know about Utah. 

We made the race a destination, and it was our excuse to drive out through South Dakota, Montana, and Wyoming and hit Mt. Rushmore, Yellowstone, and Glacier National Park. 

CdA and Austria are 2 weeks apart, so you could train with the CdA group and race either CdA or Austria (you may need to do one long ride by yourself, since the CdA guys might taper just before your biggest ride.  St. George is much earlier.