If you get the combo you have a backup amp and a convenient rehearsal amp.
I don't see any downside in adding a 410 to a 210 combo. The 210's get a little less power but the rest of it goes to 410, quite an upgrade over 140w into 410. They aren't identical tunings so you could find they don't play well together
Sparty makes a good point that you could upgrade the amp on the 8x10 stack later.
I prefer to find the matching 210 for the combo and sell the 410. Then you have a nice rig for everything except outdoors with no PA.
Team Trace Elliot #1, Mediocre Bassist #399, Old Basstard #86 Kala U-Bass #22
Swamp Kauri custom 5str. Stagg EUB. Krappy 5er FL.