"for long term uses what is the best next logical purchase?"
A Mac.
Which Mac?
Depends on what your needs will be.
If you need portability, perhaps a MacBook Pro.
If you DON'T need portability, but prefer a "desktop Mac", then an iMac or perhaps a Mac Mini.
Some of us prefer the Mini to the iMac.
It lets us use our own peripherals.
You can "bring over" the display, keyboard, and pointing devices you may already have.
(you can still use your old peripherals with other Macs, too)