I would say that the NT1 should be able to cover those three different sources.
The other possibility would be to get two or three microphones that would specialize at each source. As a great vocal microphone may not be that great with a violin etc.
A MXL V67g would do ya good for vocals coming in at about $80. that still gives you $220. to put towards a small diaphragm condenser microphone.
You can check out a Naiant X S omni Microphone for the violin at about $40. and that still leaves you with $180 for a SDC.
Well a Rode NT5 SDC is $200. for the acoustic guitar.
So there you have three good microphones that do really well at what they do, for a total of $320.
Plus now you have an assortment of flavors, and if you have to you can upgrade your microphone locker in the future you've got a good start.
♫♪♫ I have a fever and the cure is cowbell ♫♪♫ .......... *LIVE FREE OR DIE* .......... ♫ I'm all ears ♫
☼ Mucho Loco Henry Areebah! ☼
Any mic you buy will be perfectly suited to your needs, until you use it long enough to learn that it's not.