The 891 will run circles around the 450d. As far as am, the 891 does swing up in power with modulation but not the full 100w, it swings like 3x the carrier. 20w carrier gives around 80w with modulation on the peaks. It is low level am modulation so there you go. But for what it is, am and fm sound great. The band scope is at best meh. Its not a real time scope in that you have to press the scan button and it will sweep the frequency range you program once. Also the receiver is muted because again, not a real time scope. Trust me, you wont use it much if at all. Oh yea, when you do use it get your reading glasses out, it is small. The dsp is really really good. When you set it up properly for the signal your receiving, the station really pops out with no backround noise. Also when the dsp is active you dont loose any fidelity for the most part and it does not have that nasty under water sound that old/cheap dsp's tend to have. Set up properly and eq'd correctly, the ft-891 is a little beast of a rig. I bought two. One in the mobile, one as portable back up. Get one, you'll love it. Side note, i got the matching ant tuner and it is cool. No pressing tune buttons all the time. Tune a frequency once and when you turn the vfo on receive, the tuner tracks with it and automatically tunes without receive interruption. Then when you transmit it will save the tuning into its memory. Way cool and its powered from the radio. Spendy but worth it i think.