You really want to get hold of a later ,more standard model for ease of finding "kit";the 7200 was my first PowerMac but the 7500 or 7600 are better since they can take more upgrading,and there are Beige G3s that should still be very cheap yet when stuffed with RAM,and a CPU upgrade are pretty powerful.And they will use your current keyboard,mouse and monitor.Plus you can network Macs easily and upgrading the OS to System 7.5.5 is free.I don't know how much shipping is to jolly ol England but perhaps a better PowerMac could find its way to you for the cost of shipping and packing
Some people forget that the older computer can still do everything it did when it was the neweset,latest,and greatest machine!Some old computers made by a company called Commodore come to mind.
The biggest stumbling block is that current websites often demand current versions of web browsers which demand current cpus and current OS----if not for that I would likely still be using my Mac IIci
as it did everything I thought I wanted...especially since I wasn't concerned with megapixel photos and full-screen streaming videos!(Actually at 1.2 to 1.5 M DSL ,I still don't do much video,but 14.4 dial-up did surprisingly well in a TINY Quicktime window.Ahhhh,progress.)