The BIG thing I noticed with the more expensive reel was how much smoother the drag is. You don't want a herky jerky drag system when you have a potential personal best on your line.
IMHO the absolute best reels/ drags I have personally dealt with for the $ are Shimano (chronarch, curado, core) and Abu Garcia (winch, STX, Premier). Value for my dollar I would buy Revo STX all day long