25K miles wont get you far. its 85,000 RT in coach, There isn't really enough time to get the extra miles.
For prices you may want to check kayak.com or google.com/flights to see what prices are for cash flights. Business class would be expensive. I know the non-stop united flights to Dubai is usually pretty full but at least one can buy Economy plus for extra legroom. Its about a 60-90 ride to Abu Dahbi and a few companies that provide transport.
Ethiad flies to Abu Dhabi non-stop from Chicago, Dallas, NYC, Washington DC. although the seats will be fairly cramped compared to Economy Plus