Altair Astro GPCAMV2 just launched for just 170 GBP. It's a planetary and guide camera that is way cheaper than ASI224 (although the price isn't final yet). The IMX224 sensor have been proven for its very low read noise and high sensitivity.
The new camera will likely try to be as good as already proven and used ASI224 camera while keeping lower prices. How it will turn out time will tell - but the low price is definitely something to consider. GPCAMV2 is supported by AltairCapture, SharpCap as well as ASCOM driver and PHD2 for guiding.