well lets be honest, you would be better getting a head unit without an internal amplifier... but they cost a bomb.
thats 53 watts MAX, you will probably only be getting 35 watts RMS, & I wouldnt even buy a head unit coz of how many watts the amplifier is churning out coz its much better to just buy an amp to make the speakers active coz they will go much louder & will be even crisper!
Even the alpine internal amps arent amazing.... for example, my mate has got a set of focal polyglass 2 way componants off a alpine HU (7894 mp3 model), distorted at level 24 on the head unit, ran comfortably on 23. Stuck in my genesis profile 2 amp to run the front speakers, now runs at 35(max level) with no distortion at all. ALOT louder & clearer. & now he has seen the light & will never run a set of speakers off the HU again!
just my 2 pence mate! good luck in choosing tho.