Australia. I got my PR (green card equivalent) after working 3 years and applying for citizenship now (5 years since I arrived here). Spent less than AUD 10k total for immigration, including my partner visas. Processing times are reasonable and very transparent.
It's not a perfect system but way better than most countries.
Singapore used to be ridiculously awesome (work visa approvals usually processed in under 24 hours), but they've really tightened the screws in the last few years, particularly on granting permanent residence, due to political reasons.
It's not a perfect system but way better than most countries.