New bike vs. new components

[LivetoRide]

Have you tried adusting the tilt of your saddle?

And what type of shifters are you wanting to put on your current bike? Bar-end shifters? Stem mounted shifters? Or STI? As STI shifters are generally the most expensive part of a groupset (think a couple of hundred dollars minimum for STI levers) but if you don't mind going with one of the other options, they can be had for much less.