I'd go for Spring MVC version of REST, it suppports Dependancy Inversion(DI), Also spring supports many pluggable features like support for freemarker template, jaxb, xmlbeans etc., you will have plenty of options on return data.
Also, i wouldn't disagree on using jersey or resteasy, they are very lightweight compared to spring. If you don't want to use spring, then either one of the above mentioned should work as well, there are no major pros and cons.