Since money plays the primary role with us, we have to stay realistic.
As long as you don’t have a plot where a basement makes sense or is necessary (slope), I would certainly do without a chimney and basement with a small budget. Personally, I need a lot of light and will at most make the south side darkenable, but we’ll first see how it feels for us in summer, preparing the windows so that Venetian blinds are possible in front of the windows. Roller shutters are even cheaper.
Where you can save the most is the size of the house. At first, we thought about 130 sqm and are now building 110 sqm, but with a company that we (so far) really like.
If warmth doesn’t bother you, you don’t need air conditioning. We will have an air-to-water heat pump, with which a slight cooling (about 2° C less) in summer is also possible; our architect has it too and is very satisfied. Here in the forum it is hotly (haha) debated and mostly seen as insufficient.
If you just want "only" a house, then really listen to . The more you read about house matters, the more things appear indispensable, even though they are absolute luxury and optional.
What I personally pay the most attention to (although often ridiculed here in the forum) is ecological building materials and healthy living materials. Unfortunately, that is always more expensive.
And I will repeat myself once more: as long as you have such a narrow search radius for your plot, it will be very, very difficult to find a plot at all, let alone be able to afford one. Down here, 50 km from Berlin, prices are already over €330/sqm. Closer to Berlin significantly more expensive. And prices just keep rising month by month. Unfortunately.
I still keep my fingers crossed for you and hope it works out!