As we wrote in your other thread basically asking the same thing, if MC 2 doesn't support VST instruments, you're missing out on millions of new sounds. It's possible that you can find more and possibly better DX instruments for sale somewhere on the internet, but it seems that the industry has mostly moved on to VSTs.
On the other hand, if you use the Staff view extensively to write your music and use the keyboard shortcuts a lot, those shortcuts have been removed from the newer programs, alas.
Music Creator 5 is no longer available from Cakewalk but you may be able to find it in a retail store bargain bin, or maybe on Amazon. If it's new and has never been registered, you can use it.
As a registered customer, you can upgrade to Cakewalk's SONAR X3 for the paltry sum of $49 and get several VST instruments with it.
What kind of music do you write?
Yes, you can write in the staff or record and hear what you wrote with all of Cakewalk's programs.
Edited: X1 to X3.