Depends,
If the 1905 is truly shipping with the new 8ms MVA panel then it would be by far a superior monitor to the TN based L90D+.
Faster overall refresh, true 16.7 million colors, and just a better overall screen.
Thats if its true that the 1905 is now using that screen (Cant remember who makes it, but its the first 8ms MVA panel). I have heard it has switched over to it.
Its the same screen the Viewsonic VP191B uses (At least the newest iteration of it, there have been three as I understand) and is very very nice from what I hear.
Another plus for Dell, best return policy of any LCD retailer out there. Twenty one days of exchanges for just about any reason. Places like newegg require quite a few dead pixels before you can exchange. Dell does not.