Phono Preamp?

Looking at the internal photo of your amp it appears you already have a phono stage with 'guts' similar to most $1K (or more) external units.
I wouldn't under-rate what you have.

I've got plugin phono cards for my Rowland preamp which offer outrageously good sound for their meager price ($400 option).

Don't part with any money before you compare to what you have (in your system if possible).

+1 Tobes. Well said.

Ditto...5k intergrated should have an excellent phono preamp...if anything the Rega 1 is probably the weak link.

"01-11-15: Phasecorrect
Ditto...5k intergrated should have an excellent phono preamp...if anything the Rega 1 is probably the weak link."

Just in case I wasn't clear in my first post, that's the point I was trying to make. Don't limit an upgrade to just a phono preamp. Something else, such as a new cartridge, may be a better option.