For the record, I would consider a 5700 to 4700 swap. Assuming that it is equivalent hood ergonomics, shifting and front derailleur as 5800 and as dtrain stated it will probably be around $300 from UK and can unload 5700 on eBay for at least $200. Seems like a nice refresh for that bike. I had 5700 and 6700 and currently have 5800 and I also think its night and day. I could never go back to the old 10 speed shimano