Ok, I got a psp street/e1004.
It has one tragic flaw, one none of you mentioned: the screen is crap.
How this is NOT mentioned in capital letters in every PSP Street review out there is beyond me. Maybe people are too busy pointing out the obvious ("it lacks wifi!!!").
The screen has a horrible, horrible vertical shift. You HAVE to hold it at a certain exact angle to see colors properly. Even then, it sucks when reproducing dark backgrounds or environments, and on the other hand very light colors (like white backgrounds and light colored XMB themes) feels painful and tiring to watch.
Compared to my old psp-1000, there is no ghosting (and OK, this is big) and it looks a bit sharper, but that's it. In every other way, the psp-1000 screen is better: no vertical shift (you can place a psp1k on a table and still be perfectly able to see the screen, whereas on the Street you only see shadows), better reproduction of very dark and very light backgrounds/game_areas.
So to recap
1000: ghosting
2000: still ghosting
3000: interlacing (barely noticeable and the lesser evil anyway)
Go: smaller
Street: vertical shift, horrible blacks and whites
So, based on this, "What PSP Should I Get?" ---> 3000 or Go, PERIOD. The other models' screens are subpar and painful to endure.
About the supposedly cheap plastic: it doesn't feel cheap to me. It's nice and it's the single best thing about the Street. Grippy matte goodness, monolithic black design. Buttons, triggers, D-pad and thumbstick are perfectly good and again, not cheap. What's cheap and is maybe mistakenly referred to as "flex" (but it's not) is the fact that the right half of the backcover is slightly loose and springy, in other words if you tap on it with your fingers you can "telegraph". That said, you have to purposely do it to notice or care. When you're playing, grabbing the psp with both hands, you won't notice it. Your brain will be already too busy trying to keep the screen at the perfect angle to prevent vertical shift.
Another reason for the supposed cheapness could be the fact that it feels hollow, being voluminous but light. Newsflash: that's a GOOD thing. The generous dimensions ensure a good grip but it's light so it's not fatiguing. Again, what's really tiring is trying to keep the screen at the right angle. Makes you wanna go back to a 1000 and tolerate ghosting.