Normally I have a strong opinion on certain matters, but I'm "lacking" such an opinion when it comes to this. However, I do not agree with your third point Andem: the fear that a lot of Turks will go searching for a better future in the richer EU-countries. A lot of Europeans - including me to be honest - thought that after May 2004, tens of thousands of Eastern Europeans would be rushing to the rich EU-countries. It didn't happen. What I know is that the total number of Eastern Europeans who came to the Netherlands after May 2004 was only a couple of thousands (there are more than 16 million people in the Netherlands). Now, on the one hand, Turkey is a relatively poor country, poorer than a lot of new Eastern European memberstates, which makes emigrating much more attractive; on the other hand, however, I don't think we can make any pre-conclusions about possible emigrationfloods, as after May 2004 - as I explained - it didn't happen either, even with high EU diplomats predicting a big flood of fresh immigrants.
I do agree with your second point. It is expected that if Turkey enters the EU, the EU will have to invest up to 32 billion dollars in Turkey for the first years, which is relatively much, considering that the 10 new EU countries from Eastern Europe are already putting a heavy strain on the EU budget.
Now, two-thirds of the Europeans don't want Turkey to join the EU (yet) (CNN, October 6th 2004 - just saw a report on Turkey). However, I do think a lot of them use false arguments: Turkey is not European enough; Turkey is a Muslim country, while the EU is predominantely Christian; etc. However, Turkey IS a secular country. Moreover, taking a look at the EU makes me - and a lot of antropologists too - come to the conclusion that our Greek, Cypriote and Southern-Italian "EU-brothers" share a mentality which resembles more that of Turkey than lets say Finland, or Sweden.