A few Cylinder Head Inspection Questions Options

[tornik550]

I had to take out my engine to fix a few issues. I took off the heads to inspect a few things. I figure that since I have the heads off, I should see if anything needs replaced. I really don't know the history of the heads. I purchased them from somebody on the internet. I figure the story that I got from the PO was pretty much worthless. Here are my questions-

1. I removed the springs and valve keepers. How do I safely remove the valves from the guides? The end where the keepers connect to the valve seems to get hung up on the valve guide.

2. How can I tell if my valve seats are worn?

3. Approximately, how much am I looking at spending to replace the valve guides?

4. If there are cracks, are they typically visible to the naked eye?

5. Are there any other major issues that I need to look at when inspecting the heads? I am replacing the entire valve train so I am looking more for non-valve train related issues.

Almost forgot- I am working with a tight budget (another kid on the way).