Newbie question - equipment with good resale value

Hi,
What are some brands and models that have a liquid market in them?
I have a system (a cdp, integrated and two speakers) that I am somewhat happy with. At the same time, I would like to try turntables and tube amps. However, I don't want to make large investments. Rather, I would like to buy used equipment and sell it if I don't like it. Yes, I made some trips to the local audio stores but they have limited number of choices, they are are all expensive and are all similar to each other.
What are some brands of turn tables, integrated or separate tube amps that you would recommend I can buy and try without loosing too much in the transaction?

Regards,