Well, if you want to know what I had in my last truck (an IASCA pro-comp vehicle), I had a total of 9 Kicker ZR1000 amps (yes, a total of 9000 watts RMS -- and a separate 195-amp electrical system just for the stereo) and competed in Sound-Q Plus. One of them ran to my mid/high array (2 Kicker R25 tweeters, 2 Kicker R5 mids, 2 Kicker F8 mid-bass -- amp gain set VERY low for more dynamic head-room), 4 ran to Kicker 12-L7 Solobarics, and the other 4 ran to Kicker C18vr Comp VRs (all of them in the bed with a welded blow-through to the cab). I hit a steady 169.4 dB from 21KHz all the way down to 16Hz. You might say it was pretty loud and sounded pretty good. And I was considered the LIGHTWEIGHT! LMAO!
If you want to know what I have in my current truck. . . Well, let's just say that it doesn't have anywhere near as much ignorant wattage as the last one: I have 22 watts by 4 from the source unit (a Pioneer MOSFET head unit -- 45W x 4 MAX -- going into Kicker Impulse 4x6s and 6.5s) and 180 WRMS going into a single Kicker Impulse 12. Not much, but it sure beats the factory system.
As far as your question: depending on how your system sounds is whether or not 250 watts is respectable. What are you running it to? I hate to say it, but $$$ has a lot to do with it -- I would rather have a nice 50Wx2 high-end amp than a low-end amp pushing 2000 watts (because that 2000 watts is an ILS rating: If Lightning Strikes it, it MIGHT make 2000 watts). It all depends on what you have.