Just to repeat what everyone else is saying, WAIT FOR THE 30TH IF POSSIBLE! We can EXPECT pro and maybe even iMacs, but other stuff including new Airs could smack the price of that one down, or even compel you to go with a possible new option. Id wait it out unless you find an AMAZING deal. If nothing changes afterwards, go with the 512gb storage, no question. Here’s why.

Coding and general multitasking is going to be FINE for quite a while with 8gb ram, Macbooks are highly ram efficient. The fact that the m2 Macbooks with 256gb SSDs are half the speed of their 512gb+ counterparts is not highly efficient (lol). Essentially, 256gb m2 Macbooks use a different SSD than their 512gb, 1tb, and 2tb counterparts. The low spec 256gb version happens to be quite literally twice as slow.
Not only is 8gb likely going to be fine, but even if it’s not (which I don’t expect to be the case), Macbooks use memory swap, meaning they borrow ssd space to use when they run low on unified memory. With the 512, your SSD available for mem swap is twice as fast, leading to faster memory performance as well as just better read/write speeds. Unless you read this and disagree, go 512.