Actually the better the tyre is the more rubber the compound has, the more grip it has, the more easily it wears out.
Some of the worst tyres in the world are so "plastic" that they'll probably have the same profile after 50k miles as they had when new. One example of those are Tigar tyres. Alongside this you will get poor grip, poor breaking distance and a lot of noise
It hugely depends on your driving style as well, but any decent tyre should be able to go through 30k miles. Having said that, a day at the track can easily burn out the best of the rubber.
German ADAC publishes regular tyre tests, and they also take wear-out into account. I found last year's results, which should give you an idea:
http://www.adac.de/infotestrat/test...R17.aspx?ComponentId=29784&SourcePageId=31821
The last column is the wearout (Verschliess). It's german grades, so lower is actually better. The first five tyres got their recommendation, but as you can see they wear out quite quickly, especially the Continental ContiSportContact 3.
Pirelli Cinturato P7 seems like a great choice. It's also priced somewhere in the middle.
Also, have a look further down the table, all the woeful-performing tyres last forever.