IMC rating - good fun !! Better to get your hours into 3 figures first, probably.
Allows you to fly in the airspace already accessible with your PPL, with the additional benefit of not needing to look out of the windows.
Gives you the confidence to indulge in CFIT in foul weather as well as fine.
Needs regular practice to retain currency, but might give you the ability to dig yourself out of a hole you should never have got in in the first place. Or might not.