Believe me I'd definitely be going Revo if they did both engine and DSG maps. I'd definitely be going APR if they did both engine and DSG maps. I'd definitely be going GIAC if they did both engine and DSG maps. all of these have shown good customer support in the past and all would be able to support a tune for a Loba LO4XX upgrade.
MRC, JBS ( Custom- Code ), AMD, and maybe a few others I'd be wary of for different reasons.