Just fitted a ytx14-bs battery , and what a difference it makes! , only thing is its a wee bit taller as you know and I'm slightly worried about it rubbing on the seat...
i have a YTZ14BS in my 06 bike, it is slightly smaller and needs just a little packer to take up the slack, apart from that it is fine, this is a more pricey/higher rated battery than the YTX14BS but in my opinion well worth the extra :thumbup
yes, check the dimentions of the old battery to the one advertised, it should be smaller or the same, then the tilt meter doesnt need move, lithium batteries although more expensive are great in their power delivery, lots of cold starting power. They also have a battery condition tester built in that shows (when pressed) the power held by the battery, and will save you 3kg of weight , estimate.