That really is up to you based on your needs and what you can afford. Of course “better” versions are just… better. But, if you don’t need all the bells and whistles, then a version like Elements works good. I used CB LE4 for several years before upgrading to the better versions.
As far as the old VSTs go… Remember, CB 10 and above dropped support for 32 bit VST plug-ins. I suppose, as mentioned, you could get them to work but, I would kiss them goodbye and use the 64 bit new ones as necessary to get the sound you want. Your system will work much better without those oldies muddying things up.
Good luck and have fun.
Regards