If you have any cash left, go spend it. There's Lego, Jak and Daxter or Ratchet and Clank trilogies (for £6.49), Digimon, GTA, Killzone, Civilization (£7.99), Gundam, Unit 13 (for just £3.99) and much more. Check out my Black Friday and Christmas sales page for store deals elsewhere (US, Aus and EU). Deals are live until the 28th, when I guess slightly different Cyber Monday sales will kick in.
For newer games, hope Sony does its 12 deals of Christmas again!
UPDATE: THE US PSN Flash sale offering is almost identical to the EU one, good if you like collections and RPGS!