Jan R,
If you do not want to spend a lot of money, my suggestion, get a pre-owned Lenovo Thinkpad i7 quad core with 8-16GB of RAM and at least 256 GB (preferably SSD drive) ThinkPad T430 might be a good option. They are build like tanks (military specs, not your average electronic shop laptop) and are very easy to maintain (upgrade ram or hard drive). You can get them for $200-$300 used. Parts are cheap if something breaks. Should run BIAB well and should last for years.