If the TipTop ECHOZ & Z5000 are anything as good as the ZVERB I just got I'd check those out too.
+1 on the Mimeophon though, clocked or unclocked, frozen or Flipped it can get quite creative. My only critism of the Mimeophon is that the Reverb 'Halo' can get a bit Phaser/Flanger-like so best only used subtly.
Enjoy your spare HP, don't rush to fill every last space, this is not like filling sticker books. Resist the urge to 'complete' your rack, its never complete so just relax.