I would say if I were in your position, the 5235 would be the choice. You have waited a year for the watch, no harm waiting slightly longer. Remember, the longer you wait, the better it is, and the better you will appreciate it. Nobody likes an easy A.
Economically speaking, this year of waiting and the further 3-5months would help you keep your banker happy, and also allow you to take opportunity of the markets to earn some extra dough if short term opportunities arise.
However, on a serious note, the 5235 presents itself as an important milestone watch for Patek. The regulator, the hacking seconds, the unique dial layout, the first Spiromax and Pulsomax hairspring, escape wheel, anchor all in silicon, the supposed longer power reserve, the departure from the 'boring', 'predictable' dials, movements, parts of a normal PC, AC etc.
These makes the watch not only 'attractive' on the outside, but also on the inside! A real understated historical timepiece! Remember, a FIRST is always better than a reproduction or 'relaunch' of a previous model.
Not forgetting, I doubt there ever will be another production piece from Patek that would look similar to the 5235. The perpetual calendars have been in the catalogue for the past 20-30years, all with the same movement, case designs, layout, Mostly at least. The 5235, a look and you would know it is the regulator from Paatek without scratching your head which verison/year/brand/model it is.
Therefore, it is definitely worth the wait for the 5235. Don't forget, there are dime a dozen of the perpetuals in the market and if you want one, you could pick it up CHEAP in the second hand market or the dealers. The 5235 is so so so so tough to get that adds to its allure. The 5235 might be cheaper than the 5940, But hey, if you ever wanna get rid of it, you know it's gonna move fast, without sacrificing on the price!