I absolutely agree on the Viggen being great. That said, you probably need more space than a school yard to fly it, especially as a beginner and you really should have experience with at least one other plane first.
I hate to say it, but unless you have an RC club to fly the Habu STS at, you probably are much better off with a prop trainer. If you can find one of the discontinued UMX Habus with safe, that might work in your space. I haven't flown the UMX MiG 15 with SAFE, but you might also reasonably have success with that.
In terms of a scratch-build ultra micro, until you have a lot more experience, it's going to be very frustrating to try. Smaller aircraft are much more sensitive to small construction issues and weight. Again, I would recommend a prop trainer, but if you are determined to do an EDF, I wouldn't go smaller than 50mm unless you can find a UMX EDF with SAFE, and no matter what trainer you find, I would try to find a larger flying field. Small spaces are not conducive to learning and smaller aircraft don't necessarily get slower than large ones.
Another option if you want a jet is to look at prop jets like the FT F-22. You can't tell the difference in the air apart from sound, and they have so much more thrust available and handle slow flight so much better.
