I want to hear that Markbass amp! I live in Germany. We don't have all the Chinese stuff here, but I think you can get a decent European carved bass here cheaper than in the States. Also, I really think we have better luthiers and repair people.
As far as new stuff goes, it is much cheaper in the States, even if it is made here. I have heard of people sneaking Pirastro strings back in their luggage when they have visited the US. They cost almost double here, in the country where they are made! It is not just the VAT. There are retail pricing restrictions here, and also a certain attitude. If you try to have something shipped from U.S. to Germany, they kill you with import duties. Items with a declared value of under 50 Euros (~$62.50)are supposed to be exempt, but my cousin sent me some towels as a wedding gift last summer, and the "Zollampt" made me pay like $35 in duty. They had wrongly included shipping and U.S. tax to get over the €50 mark, so I eventually got it back, but my point is that there are some serious fair trade issues going on here.
As far as Amps and electronics go, You've got to be careful about compatibility. When I moved here, I brought along my Hartke amp, which claims to run on European 230v/50hz. It works, but hums badly. I had the same problem with other power amp gear. Transformers designed for North American 60 hz have a bad time with EU 50hz. I haven't seen much about this, but I would like to know which amp gear can be used on both continents. Professional musicians ought to be able to cross the Atlantic with their own amps.
So, in conclusion, buy your strings in the US, buy a nice old bass in Europe, and buy your amp in the country where you plan to use it!
Robobass