I have one X5000 and it's the best allround amiga i have but i would highly recomend you to have atleast one classic available too, they are both needed for the best experience

I do some emulation with uae on it but sometimes it's very satisfying to fire up one standard A500 and have a go, or a vampire expanded.. or 030 or 060 etc .
But if i could only have one i guess i would keep the X5000.