Advice: Which 10 speed Shimano mech with 9 speed MTB cassette?

[GrumpyGregry]

Plan is...

CX50 46-36T chainset (new)
nine speed Ultegra bar end shifters (from the parts box)
9 speed Deore HG61 11-32t cassette (from the parts box)

Need a mech. Obvs (I hope) 9 speed Sora 3500 medium cage mech should work.

What Shimano 10 speed mech options will work ok with that combination of shifter and cassette?

 

[Spoked Wheels]

"9 speed Sora 3500 medium cage mech should work." Yes, it will. The 105 GS will do too and it's a nicer mech. You can go as big as 34t cassette.