For the last few days, I am quite proud of myself for not giving in to the temptation of GAS ... I sold some of my gear last week and got about $3000 on Thursday (hopefully my G1X and some accessories will also be sold in a few days time, so that should get me close to $4000 in total) ... so far I have not spent a single penny from it ... I was very close to buying the Tamron 150-600 VC but successfully held off, coz I'm weighing my options between, 150-600 VC, 300 f/4 L IS + 400 f/5.6 L, EF 100-400 L IS ... I did own the 100-400 L IS, until I sold it in 2011 for some much needed cash at that time, also played with the 150-600 VC for 10 minutes at the local store, so I know what to expect from those 2 lenses ... but I have never tried the other 2 L prime lenses ... soooooo many choices, but only limited budget .... not sure how long I can hold, coz the GAS is getting real bad