The E is a pretty good gun and it's the only external extractor 1911 I'd bother with but $1500 is a lot for that.
I have no particular love for the 345 but if yours works well, I don't know that the E will do much the 345 won't.
Besides which, if you step up a few bucks you can get a Baer, which is kind of the entry-level semi-custom. They're not the works of art Wilson is putting out but they're typically extremely accurate as their effort goes into the barrel fitting process, at the expense of some detail stuff and cheaper internals (relative to Wilson, I mean. Their small parts quality is at least as good as the S&W). But it allows you to get a semi-custom 1911 relatively cheaply, that performs at a pretty high level. Baers are kind of the bang-for-buck option in the semi-custom world.
A Baer UTC or Thunder Ranch (basically the same gun) will often go for 17-1800 in pretty near mint condition and it's a better example of a 1911 than an E, no offense to S&W fans.
So there's my thoughts. If you want a 1911, and you're prepared to deal with a $1500 price tag, just pick up a minty Baer for $1750 or so and own a pretty decent semi-custom.