Asking for an LS 500 third party warranty recommendation

I know: "don't do it." But I really like the car I found and parts on an LS are $$$. The LS I want was being sold as a CPO, but has sat on the lot past the CPO warranty time to kick in. The dealership put thousands into the car to get it to CPO standards. I don't know why it's been on the lot for 5 months. Has anyone here bought a 3rd party warranty for an LS and not regretted it? Please comment or DM if you would recommend or not recommend a company based on your experience.