Am I crazy to flip 2 Rolexes to buy this?

[baamvino]

Hey guys, 2 watches - 1815 UpDown & Lange 1 from ALS have caught my attention recently, but I need to flip 2 watches from my current collection to fund one of the watches from ALS since I am only looking for a brand new watch. (We all know that MSRP at Lange is pretty crazy)
Befor I make any move, would like to ask you guys if I am making the right choice.

Here is my current collection -
126710BLNR(Batgirl), 114060(Sub NoDate), 16570(Expii Polar)

My questions are -
1. Since I have to flip 2 watches, what would be the one watch that should be stay in my collection.
2. Between 1815 UpDown and Lange 1, which one will be better to join my collection?
3. Am I too crazy to flip 2 Rolexes to go for ALS?

Here is the shots I took from AD yesterday