If you shop around, the Periphery Ring and Center Weight is about half price of the Super Platter. Also, the Periphery Ring and Center Weight will work on the Super Platter.
I would opt for the Periphery Ring / Center Weight combo for now keeping in mind that it will only improve from there on once you go for the Syuper Platter at a later date.
With the Periphery Ring / Center Weight, your LPs will be perfectly flat which will allow your cartridge to work at its best.