Robin, my earlier post to you had some suggestions.. go back to page one, those are the ones that I'm considering. Airplane Nuts listed his servos too that he is installing.The Cirrus look interesting to me though I do not have any experience with them (brand) and they are a new model for Cirrus. I pretty much stick to Futaba and Hitec. I've seen a lot of crashes from what I consider to have been marginal servo selection/installation. Were I to go with those servos I would probably expect a shorter service life, sell them after a season on E-bay and get another set each year.
All products have a useful life span, like a car. If you change the oil often and drive reasonably the car will last over 100K miles. If you race it 500 miles as fast as it will go, it stand a better chance of not making it to 100K miles. That's how I look at stuff like this. Say you get behind the airplane a little cause you've had it up in the air a few times and you're getting comfortable and are trying some stunts... you make the wrong control input and slam the control the other way to correct...then what happens? Better safe than sorry I think, That's why I'm selling one of my children to pay for servos for this bird LOL!