Arizona is certainly the top one in Astro instrumentation, albeit less strong recently is observational work. Ohio State Astro has a strong instrumentation program and is also strong in observation. Michigan and Chicago has good instrumentation facilities, but I am less familiar with their current projects. You can write to them and ask.
Check this thread for basic intro to the various Astro programs, if you need -viewtopic.php?f=21&t=2607