Phono stage: Depends on your budget. Assuming you're going one significant step up from the Creek and are looking at the used market I'd look for a Sonic Frontiers or perhaps an ARC PH3. Both use tubes. Either can be had for under a grand.
Speaker Cables: Lots of choices there. I like DH Labs Q-10, and it's a bargain even at retail. I'm not familiar with your current cables though. Q-10's are very detailed and revealing in my experience.
