Why wait a few years? You'll just give them an opportunity to jack
up the application fee again. Get the process started ASAP so
you can get through the waiting period sooner.
Nah, I've just plonked down $390 for this process and my ducks
aren't aligned just yet. Thanks tho! 
The guy at
the green card office who helped me out was even encouraging me to
take up citizenship. 