Hi Shambo
Suggest you read the fine print carefully on your existing agreement, these agreements are usually based on a fixed interest rate and will draw an early breakage cost on the customer.
AFAIK, different finance houses become more or less competitive at different times of the year, for leasing at least. Check out the usual suspects such as GE, BofS, Lombard for commercial quotes and stay away from dealers offering finance, they are earning commission which is built into your monthly payment !
Cheers
G>