I WATCH THIS: A lot of times there is a deference between the "minimun valid bid" who ask the myibay program (when you put a snip), and the real "minimun valid bid" who ask the e-bay site , when the price is in Euro. in nr. 330681453558 item, the carrent price is 152 euro, and the myibay ask for "minimun valid bid" 153,5 euros, but the same time the e-bay.co.uk site acept valid bid in 153 Euro. If we supose the bid was finish just now, and i had give in myibay as maximum bid 153 euro 6 secont before the end, what would happen? The myiday will give this bid,or it will count it as invalid and it will not give this bid?

The minimum bid is for information purposes only and does not affect anything. You can even put less than that if you like. It will still try to bid no matter what.

Bid increment system is different for different currencies, so you have to take it into account when deciding your snipe amount.
Please check the following for link about different bid increments:
http://www.myibidder.com/login/faq/4/#q14