A friend whom I trust explicitly in these matters said (a few years ago now) that the Lollars were the best P90 that he'd ever heard (and apart from being in various Cambridge UK bands with Dave Gilmour and Syd Barrett, he also spent 15 years in Nashville). But things change all the time and there seem to be more pickup makers out there than ever. But the Lollars are certainly very good.

You can simply get a dog-ear cover and replacement backplate to turn a 'normal' P-90 into a dog-ear, but it is nicer to buy a complete unit. Because the ES-1 kit has a curved top, it's a bit harder to source suitable dog-ears, Flat bottoms are easy, Actually the neck location on the ES-1 is almost flat, the bridge has a definite curve. Shims are an option (and are the only workable method of getting the pickup nearer the strings for a dog-ear), but on my ES-1, the neck position won't have enough height to fit one.

Also note that a quick search for 'dog-ear P90 dimensions' turned up a whole mixture of dog-ear cover sizes, whilst the 'standard' P-90 does seem to be a standard size.