Stripes, Spring, Play ( или?): какую высокопроизводительную среду Java использовать?

Мы начинаем создавать веб-приложение, которое, вероятно, будет видеть много трафика. У нас не так много денег, поэтому мы хотим снизить стоимость оборудования. More or less, I think that means we will try to be as stateless as possible (as the Wicket way suggests - have bookmarkable URLs, etc. etc.)

The other problem is that we are gonna be hiring contractors (think oDesk or elance) for chunks of work - so there is the question of finding talent.

I have looked at Tapestry and seen a lot of API instability ( see: Why did you stop using Tapestry? ) which makes me reluctant to use it.

Seam and Wicket are highly stateful - not something I care for.

Grails looks to be very interesting. I know that there is a performance hit as compared to pure Java, but it might be worthwhile.

Stripes looks good, but I cant find examples of websites that have been built using Stripes

Which Java framework do you recommend for performance and simplicity ?