I have for years run Optima batteries in my Jeeps and with good results had no hesitation in putting one in the Crossfire. 

Here is the skinny according to Optima:

Inside this unusual battery is a six-pack of SPIRALCELL TECHNOLOGY®. Traditional batteries have a stack of thick lead plates surrounded by acid. But OPTIMA® batteries feature two thin lead plates wound into a tight spiral cell, with an absorbent glass-mat in between to hold the electrolyte solution.This unique design allows for more power and increased energy, resulting in quick, reliable starts. OPTIMA batteries are the first and only batteries to feature SPIRALCELL TECHNOLOGY.

• It'll last up to 2 times longer than other batteries.
• It can sit unused 3 times longer than other batteries.
• It is over 15 times more resistant to vibration than other batteries.
• It's nonspillable and can mount in almost any position.
• It provides constant performance quality keeping your battery running at the same level even as it's being discharged.
• It provides more power in the inital 1, 3, 5, and 10 seconds of the vehicle starting process than comparably rated conventional lead acid batteries.

Here is a PDF file with the technical specs for this battery:

34/78 Dual Terminal Red Top™

	Hold Down and Height Adapters
	OPTIMA® GROUP 75/35 The OPTIMA® 75/35 battery may be shipped with a height adapter installed. It may be needed in one of 2 ways for installation: In vehicles with a top holddown where more height is required, it should be used in its original position. In some Ford, Lincoln, and Mercury installations (replacing a group 65 battery) the bottom holddown of the battery must be made wider. For these installations, remove the adapter and detach the two strip adapters which are located inside. Snap these strips into the openings on either side of the battery base and discard the remainder.If the adapter is not needed for installation, it may be discarded.
	OPTIMA® GROUP 34/78 The wing adapters available for the OPTIMA® 34/78 may be needed for some Ford, Lincoln, or Mercury applications (replacing a group 65).Attach these wing adapters by snapping into the openings on either side of the battery base.
	OPTIMA® GROUP 34/78 The optional puck adapter is required for most GM installations where the side terminals are used.Position the puck against the center cylindar of the battery and bolt to the battery tray as shown.
	OPTIMA® GROUP 34/78 The optional red or yellow height adapters may be used for installations where a group 24 is required. Place the battery securely on top of the adapter until the clips snap into place.