Look at the Penn Slammer. It is essentially a Penn Liveliner (of which I own a 460 and 560), just without the switch on the back.
The Shimano baitrunners are excellent, and function as the liveliners, but they are huge and cumbersome.
For your intended purpose, the Penn Slammer 360 is your best bet, and no bigger than the 460.
Zachary