if you want a REALLY great coat prep, then go with a stand dryer! It will take a bit longer, but it's SO worth it. You will notice that your grooms last a lot longer and the dog will mat less.
A high velocity dryer is great for removing most of the water very quickly and setting up the coat for stretch drying, but it's not really going to straighten the coat as well as a heated dryer.
I have both and use the HV to get the water out, then finish (curly coated dogs) with the stand dryer to SET the coat. Some times, with small poodles or bichon's, I just use the stand dryer 100% and it really does make a huge difference in the finished groom.
You can also save A TON of time it takes to dry if you use the car drying towels (walmart $5) to help suck out the excess water before using a regular towel. I like these much better than the Sham-wows or moisture magnet towel.