I've known Christians who believe we are all called to a life of financial poverty. Have heard sermons by pastors who preach that we're to "name it and claim it" and live a life of great wealth... what are your thoughts, please?
Thank you
If your interested, there is a book I would recomend. Its relatively thin. The book is called Orthodoxy by GK Chesterton.
The book addresses a number of different things, but I thought to recommend it because the last two questions you've asked have both reminded me of what I read in that book.
I highly recommend anything by GK Chesterton, but Orthodoxy is a great starting point.
Anyway,
I think the answer is that both views are right, and both views are wrong

Some, perhaps many, Christians run into the problem of believing that God has given everyone the same call that he has given them. They feel a calling or a conviction, and so they think anyone else who doesn't feel the same thing isn't doing it right!
The reality is that God calls different people to different things. He calls some people to marry, and others to celibacy. He calls some people to poverty, and others to wealth. He calls some to fame, and some to obscurity.
Its not that one is better than the others... but that each person lives to the glory of God in the calling that God has given them.
Christian balance (this is from Orthodoxy the book) is having everything in its rightful place, not having everything muted towards the center. The proper Christian balance between poverty and wealth is not that everyone must be wealthy, or that everyone must be poor, nor is it that everyone must be in the middle with neither 'excess'. It is that those whom God calls to be poor, serve God with their poverty and those whom God calls to be wealthy, serve God with their wealth.
God is honored by both when they are in their rightful place.