I think once you've heard a decent mono cartridge it is hard not to see it as an essential purchase.
I blame/credit Tom :-)
I currently use an arm pod alongside my Lenco with a Schick, Miyajima Zero and really rate it.
(Assuming you haven't gone for a massive plinth this would be an option?)
Annoyingly I also decided the mono SUT was a worthwhile purchase once I had heard it...