Bonanzas are great airplanes, unfortunately not many of them flying in Europe.
Keep in mind no matter what registration you fly under, you have to comply with the operating rules for the countries you fly in. If you're importing an airplane from the US, you may have some expenses for required upgrades:
1) Mode S transponder: many GA aircraft in the US have mode C only, in most of Europe mode S is required.
2) DME: most newer GA aircraft in the US (late 90s to now) don't have DME if equipped with IFR GPS or glass cockpit. In most of Europe you cannot substitute GPS for DME.
3) ADF: same as above, although only applies in a few European countries.
I've imported several airplanes in the past year, PM me if you'd like to discuss more.