Well I feel like the box is a massive would be nice for the system (it's well made and has a little space inside so doesn't break first time you open it but its a console box so you only open it once), have seen a silver boxed one like elf_2009's for £55 in a cex and would use that as a bench mark for buying one. The eBay prices are a bit wild when it is console only but if there's a bundle with boxed games then there are deals to be had. Been helping a colleague at work find one that went for £75 with UK metal slug 1 and pocket tennis which is a good deal given the boxed games are £45-£55 as a pair.
Have a look on cex online for the colours you want to start with though.
Someone without the black one!
have you noticed fatal fury has a typo in the printed name of the game in the top left?