Best bang-for-buck purchase you have made?

Paid $500 for an Arcam FMJ CD23 and sold it for $1275....then turned around and bought my Gryphon Linestage for $1200...both are great purchases but the dual mono preamp was a far better benefit for my system than the Arcam.

Just the list here :

1. Forte 4a amp, $450

2. Apogee Duetta Signature speakers, $900

3. Paradigm Studio 20 speakers, $250

4. Paradigm Studio 20 Active speakers, $695

5. Velodyne FSX-12 sub, $300.

6. Citation 7.0 surround pre-amp using the analog pass thrus, $300.

7. Citation 7.1, 4 channel amp, $695

8. Reference Line Premminance 1a passive line stage, $395

9. Reference Line Silver Signature amp with outboard high current power supplies, $2500 (the best amp I've heard...period!)

Scott 299 Integrated, $30 + $180 in parts from VTV to get it running .
Curiously, never found a really good deal in a good digital source (closest Marantz CD 63SE, California Audio DAC). I was actually surprised by the quality of my G5 Mac when streamed to my system.

No question its my IPOD

3-way tie, I think:
1) Dared SL1200A preamp (w/Mullard CV4024s & a Bendix 6106 rectifier), replaced a Sonic Frontiers SFL-1
2) KAB/Technics SL1200MK2 turntable that absolutely wiped the floor with my Michell TechnoDec/Audionote combo
3) $50 Chinese 6SN7-based USB DAC (listening to Pandora Radio with it right now, wonderful w/a pair of Raytheons!)