From my own experience, I started with a blade grinder but found that it didnt quite cut it after I learned more about the whole coffee thing. I came to realise and other posts on this forum will confirm that the grinder you use is as important, if not more so than the machine you use. If your blade grinder is doing to job for you at present , it would probably be wise to wait till you can afford a good quality grinder like the Gaggia MDF or Rancillo Rocky. Even the Sunbeam em0480 or em0450 are decent grinders if you get good one but dont think they are available in the US.
By the way. Welcome to CoffeeSnobs, so far Ive found everyone very helpful and friendly. Some of the threads are just so funny at times you cant help but check back everyday to see whats going on. :)