What alternitives are there to WCF Test Client?

I feel like it should be easier to test my WCF Services.

Is there an alternative to WCF Test Client?

Something with these features:

1. Can save my object trees (method parameters) to be used again.
2. Ideally it would even let me identify GUIDs that need to be re-generated on each run and ones that should stay static.
3. Easier to deal with arrays, lists and nullable types. (For example, if I have an array of nullable types, I have to enter the length of the array and that that each one is not null before I can fill in values. It just seems that there should be an easier way....)
4. Can save the "Config File" between runs. (My services return more data than the standard 65,536 in MaxBufferSize and MaxReceivedMessageSize.)

Free is best, but if I have to pay to get a good tool I will consider it.

I use WCF Storm LITE to test my WCF services. It's more user-friendly than WCF Test Client, although the free version has limited features compared to its commercial counterpart.