i actually beleive that their lower end amps, the intake series are the best amps they make. the higher up ones lose the power they claim to put out and the price jumps up alot
iv got the a6004t and it works great, and puts out the power it says, i dont know how much power your looking for but hte a4002t puts out 100x2rms i belive and its like 100$ online
I have an A1502DP & an A1504DP and they work very well...and they are 1ohm stable in all channels (I know because I was running some type R's off of 2 channels on the A1504DP.
You can get the A1502DP from Eclectic Mart (Ebay) for alot less than $350....got mine for a little over $200 including shipping.
I've owned a lot of amps and for the money I think the Digital series is close to the top of the list for $$ vs. performance.
Now Audiobahn's subs and speakers are a whole different story...wouldn't own those if you gave them to me.
Just my $.02 if course and I know other people will bash this post no matter whther they've listened to the digital series or not.