Any of those chassis will do well for you given they are setup right. LiPo is definately a consideration and the Xray will be a bit more fussier to get the battery to fit. Link cars like the CRC, BMI, and Speed Merchant have better battery positioning for a solid pack like a LiPo and some even have LiPo specific chassis. With the Xray you'll need to mount the battery on one side of the chassis much like TCs are today. But having that local support may be that little bit extra you want or need. My personal favorite is the BMI.