I read an Advrider thread a while back about lithium batteries like the Shorai. If you plan to load your bike up with touring accessories like heated grips, heated gear and GPS, then get the biggest lithium iron phosphate battery that will fit or one that has the closest actual amp hour rating to the standard battery. The balance charger will be needed from time to time to keep your lithium iron phosphate battery at peak performance.
Otherwise, consider an AGM lead battery. A properly made AGM battery will tolerate deeper discharges and reduce self discharge better than a conventional lead acid battery, without the extra attention needed by a lithium chemistry battery.
Lithium batteries lack capacity in the very cold conditions too. On Advrider, they recommend putting a load on the battery to get it to warm up enough to have enough cranking power. Of course, this uses some of your available charge to warm the battery! It may be worth consideration if you plan to tour somewhere cold.
My friend installed a Ballistic 20 PbEq Ah battery in his Xciting, but it may have been a little undersized for his usage. He replaced it with a high performance lead acid battery. We tested the Ballistic for capacity and managed to get only 6 Ah out of it. Ballistic advertises it at 6.9 Ah actual. I personally didn't think it was worth the effort to install his lithium battery into my significant other's bike plus additional care, so I picked a high-performance Yuasa. I feel I will wait for the technology to mature some more and become cheaper.
Hope it works for you if it meets your needs!