Cool 4x10 Fender amp with Reverb? Cool is subjective. That said, the marketplace says the BF SR’s would be the ‘coolest’. Then, any SR before 1971 when they went to the glued in baffleboard is next ‘coolest’. The cool factor for some keeps declining from there on...with the ULSR’s being the least expensive....least coolness of the basic circuit. Some might think that the River era Concert II in the 4x10 format would be cool in that it has overdrive capabilities that the earlier Fenders don’t have...except for the Lead 75 in the 4x10 format. Or...since you don’t seem to be afraid of lifting the weight, how about a Quad Reverb, which basically a Twin Reverb in a 4x arrangement...albeit with 12” speakers instead of 10’s. Or...the Suoer Six Reverb, which is a TR with 6x10’s. The price per pound goes down as the weight goes up!