i also recently had in my system a couple other nice tube preamps - the cary slp98 - really nice, but not in the same league as the melos; the magnum-version of the rogue 99 - nice, but too coloured & lacking frequency extension in my system (might have been an impedence mismatch; rogue sez output impedence is 100 ohms, but my testing indicates its more like 2400 ohms). i tried an ar sp9 mkll several years ago, & it was awful in mny system; the solid-state electrocompaniet ec-1a crushed it.
as far as what percentage to spend on what piece of equipment, i'd suggest looking for a great deal on a used 'table w/an arm. it may or may not already come w/a cartridge. depending on how much ya have left, then decide on the fonstage &/or a tubed pre w/or w/o fono-stage. (the other adwantage of a tubed preamp is yule find your cd's are suddenly listenable!) ;~) if yer scared of a used cartridge, the needle doctor always has the ortofon mc-25fl on sale, from $450 to $225. this is an outstanding performer, but it's lo-output, so ya have to have a quality fono-stage. one thing i found w/my melos preamp, tho, is it has so much gain, i had to cut my fono-preamp back to its lowest setting, even w/the low ~0.25mv output of this cartridge. i wouldn't shy away from a used cartridge, tho - i recently bought on this website, a lyra clavis, re-built by vdh, for <$500. the rebuild service alone is $600, on a retail $1700 cartridge. there's always good cartridge deals on this site.
good luck, doug