Hi there,
Here's my recommendation. It's not a trilogy. Its a pentalogy. But only three books are out. If you want fast paced and exiting this can be your choice. First two books are under 600 pages and third one is 40 pages over, but that's not a big deal I think.
The only thing that is bad with this choice is you will get hooked on the series and curse my name for having to wait for the last two books to get published
More on series here: Demon Cycle