Caddy mechanics San Antonio, Texas ????

My 99 Deville is putting out some white smoke from the exhaust. Not all of the time. It has been more noticeable after a heavy rain. We
have had a lot of those in the past few days. I have been advised to ask for a compression test and a leak down test. I would like to know if any one has experience with a reliable Cadillac mechanic in S.A. TX? I have no clue how to determine if the tests actually showed what the mechanic says they did and what the fix(es) might be. The 2 dealers I know of are Cavender and Ken Batchelor. I was planning to go to Batchelor, closer to home. I am open to other mechanics.
Any recommendations.
One other thing, I just bought this vehicle (July 3, 2007) and I am reluctant to take it back to the dealer I bought it from, Tom Benson. I have not been to impressed with their mechanics in the past. Any thoughts about taking it back to Tom? "As is" "Buyer Beware" etc.
Thank you
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