Dyce is £6.50 taxi fair to the outskirts of aberdeen. I am sure there would be some obliging guys at CHC, Bond, Bristows or Just of the airport.
The thistle hotel is within walking distance from the arrival hall but book early if you fancy staying close by also if that fails try the britainic hotel pricy but good.
Try also speaking to Sid Simpson at HJS they are just outside aberdeen he may be able to help 01224 739111
hope it helps
Sincerely
Bravo 99 (AJB)