I started out with a 300D (still have it)...then got a 420SEL (still have it-for sale though)...and now have a E420 for my daily. I really really ...REALLY prefer the E420 over the 420SEL (HP diff. between the 420 and 560 [in a 126] isn't all that significant when you take into consideration that the 560 weighs more). The diff. in HP between the 420's is 201 vs. 275 Viva la difference!
Save up your dollars and keep your eye out for a E420
Then again... that's just my opinion, and you can do with it as you please.
-Larry