What state are you living in? I just checked the approved weapons list for both California and Massachusets and the G26 is approved in both states.
If it's a pre-ban magazine thing, keep your pre-ban magazines. As far as I know the pre-ban magazines are perfectly legal in post ban handguns, however I'm not a lawyer or resident of either of these states. Personally, I think this whole mag capacity and approved gun list thing is pretty stupid. Makes me wonder it there aren't lead deposits in the water table or something similar making people dumber than dirt.
As for your question, can you afford to shoot the 44 Magnum and do you enjoy a weekly or twice monthly range day? If yes to both, dump the Glock and get that model 29. If you can't afford to shoot the 44 Magnum a lot, keep the Glock. I have no doubt that the Glock is far far easier to master and 9mm ammo is cheap. BTW, if you have to trade one gun to purchase anoother, it's pretty likely that you can't afford to feed a 44 Magnum.
BTW, I shoot the 40 S&W and the 38 spl. partly because they are calibers I can afford to shoot. It also happens that I enjoy shooting these calibers but the initial impetus was cost, plain and simple. I'd like to try the 45 ACP and actually shoot the 357 Magnum more often, however going in either direction would mean fewer trips to the range. Sometimes it stinks having to live within a budget but when I'm putting holes in paper that doesn't bother me one bit.