The 150w vs. 125w power handling is pretty much a mute point. In real world situations if you were to actually feed the AS-B1.2s 125w and the AS-B2.2s 150w at most you might see a 1.5dB difference in output in favor of the AS-B2.2s. Unless you actually have an amp capable of putting out 150w RMS with low THD what does it matter?
To be honest, if it were me and my money I would buy the AS-B2.2s just because for me bigger is better and I would rather have the 6 ½ in driver, the extra sensitivity, and the increased frequency response of the B2.2s, and then wait longer as I saved for the AS-R1.2s. But that’s just my opinion. Would the sound quality of the B2.2s compared to the B1.2s really be an improvement in your system and justify the price difference? That’s for you to decide by actually spending some time listening to both sets of speakers with material you are familiar with.
Even more importantly, since you are concerned with HT only, you need to listen to them crossed over with a sub so you have better idea of what they will sound like when you take them home. Crossed over properly with a sub I’d bet that you would be hard pressed to tell a difference between the 2 models. Better yet, if you have a credit card, buy them both, take them home, do some listening, have a friend help you do some DBX test and return the one you don’t like. When it all comes down to it you must trust your ears not our opinons.