How about "somewhat experienced and opinionated"?? ;)
To the point - Yes, you will find an improvement in performance using the DFII with the stock pipe. But read on!
Digression - I have an '01 200. I know about the significant differences between the 200 and the 220, but some of my experience would hold true for you, I think.
1) I ran the torque pipe, airbox mod, stock reeds. Great mid-range improvement. Much better pull out of corners, and much better power in loose dirt.
2) I ran the DF II with the stock pipe. Smoother throughout the powerband, with
maybe about half the power improvement of the torque pipe.
3) I ran the DF II and RB Carb Mod with the stock pipe - Almost the same level of improvement as the torque pipe alone.
4) Now I'll play with the torque and rev pipes. I expect some fun!
The point? Pipe makes more difference than reeds.
Bottom line:
Why are you thinking about going with reeds first vs. new pipe? Are the cost differences in Canada that great?
There is no question in my mind as to what I would do if I had a 220 and "were on a budget":
1) Rev pipe ($90-$180) - Something like half price if you get a used one from Jeff Fredette. Do the search and you'll find that most 220 riders prefer the "rev". As you probably know, the 220 is ported differently than the 200 and responds differently to the pipes.
2) Boyesen reeds - $35 (or so) - Don't get me wrong: I love my DF II! But we're talking about "bang for the buck", here. I'd go for #3 below (RB Carb Mod) before I put big bucks into the reeds.
3) RB Carb Mod - $165 - You get a carb bored to 36mm for improved top end and a divider plate to maintain your great low end. Best of both worlds!
For about $300-$350 you can have most everything you'd want (without going to porting,etc.) IMO-IMO-IMO you do not need a new silencer. After doing the three things mentioned above, dollars spent vs. performance gained are a much lower R.O.I. (return on investment).
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Anyone else out there have a different view?