Well - I was researching replacements for mine for this year - I've found the Melnor brand to be pretty reputable and seems to be well reviewed: Melnor Option #1 Melnor Option #2
Both are Thumb Control - but #1 also is trigger driven and #2 has more spray pattern options with no trigger:buffing:Im the MAN
I like Option #1 myselfrops: - and will be ordering one up shortly.
FYI - they are both metal bodies as well as the XT Line being generally pushed as their heavy duty line Melnor Site