I agree, don't rush into buying anything....... I am also a person who rush when I want something..... and usually end up buying something that is not to my liking..... and and up spending more.......
Its better to plan ahead.......Start by asking yourself what species of Ps you want, and how many...... After that then do some research on what tank size you would need for the Ps you want...... If possible get a large enough tank so that the Ps can stay there for lifetime without tank upgrade.
Ps are a messy when eating.... so I really recomend good filter setup.
I should say that I have always found it heals faster if you up the water changes to twice a week when the regeneration of a tail is concerned. (Maybe the healthier cleaner water works for regen like it does for sickness?) Not sure.
It could be just my imagination, but it just always seemed to work for me.