I thought it as a Trojan 27.
A higher wattage Xantrex. <snort>
If you want to step up in brands, although I don't know why you would, then it's, from the next step upward, Samlex, Statpower, Magnum Energy, Outback Power, Exeltech.
Concord Lifeline is the cream of the crop. Concord also makes...