15450 Advice Please

Hi All, Considering the 15450 which would be my first foray into AP. I've tried it on and think the 37mm suits me better than the 41mm. However, is it likely that the 15450 may be getting replaced anytime soon, much like the 15500 replacing the 15400? Also, I think there was a big price increase in Jan last year, does anyone know if this is an annual thing and likely to be repeated? Subject to availability I don't know whether to try and get one now, or wait to see if a replacement may be coming (whilst running the risk of a price increase). I think a bird in the hand is probably better than two in the bush but not sure how I'd feel if a new model was launched soon after making an acquisition. Any thoughts or comments would be much appreciated. Thanks