I generally agree - your money might be better invested in a single arm and table. If you still like to get two different flavor of cartridges, you could use an extra armwand or headshell if you like:
To give you some complete constructive solutions in your price range:
VPI Scout/JMW9 + extra armwand + 2 cartridges of your choice
Technics SL1200 + extra headshell + 3 cartridges
A few more good arms with exchangable headshells/armswands:
JMW 9
Moerch UP4
Sumiko MMT
SME 3009
Just a thought....
To give you some complete constructive solutions in your price range:
VPI Scout/JMW9 + extra armwand + 2 cartridges of your choice
Technics SL1200 + extra headshell + 3 cartridges
A few more good arms with exchangable headshells/armswands:
JMW 9
Moerch UP4
Sumiko MMT
SME 3009
Just a thought....