okay...so based on the first reply, the english language is a dying one. That was just painful to read and made about as much sense as bush does on a good day.
Anyway, I own a digitech rp350 and I've tried an rp80.
Now don't worry that you're gear is discontinued. It happens all the time, I just hope you didn't pay too much.
And secondly, yes, the new digitech processors are much better. They sound a lot better. It's a much less digital sound and the distortions are a lot richer and heavier.
And yes, the digitech processors do sound better than the zooms. Hell, while the features may not compare, the digitechs only sound second best to a line6. That means, IMO, the digitechs sound better than the boss GT-8 etc... though the features dont compare on the RP series. The digitechs also have the best whammy effect.
Now as for the rp90 vs the rp250, the 90 will sound a tad worse because they cut back on processing power. The 250 is good and when you think about it Rs6k isn't that much for what you're getting. Even one of the pedals being modelled would cost that much alone.
The pedal is also an added bonus, though the rp150 also has an external pedal input, so I assume the rp90 also does.
Putting the PRO and FAN in PROFANITY
-Agile Intrepid 8 String
-Kramer Striker 7 string FR
-B.C.Rich Afterburner SE Warlock w/ Seymour Duncan Blackouts
-Bassmaster 200W amp