Originally Posted by
softreset
If you're looking at the red/white 5.2s on eBay, those are considered 2013 model year bikes. It's 10-speed Ultegra (6700) and has internally routed cabling. That was one of the 'upgrades' from the 4.7 to 5.2 (internally routed cables), among other things. The 4-series frames and down, had externally routed cables.
Some of us don't think internal cabling is an "upgrade." I bought a 4.5 specifically because I wanted a normal seatpost and external cabling. Much easier to work on.