Opinions are like... you know, everyone has one. Here's my opinion...
I was in the same situation as you where blind spot and cross path were on the must-have list. I would have ordered a Laramie, but instead ordered a fairly-stripped Limited (see signature below). Blind spot is standard on Limited and still included.
You could try building a Big Horn if you want and adding Blind Spot. I think it is available as an option still on BH for $595, but not 100% certain.
If you stick with a Laramie you can't get blind spot. Also, if you stick with a Laramie, IMO the Level 2/B package is an awful value. The only differences between Level 1/A and 2/B are navigation (still 8.4" screen) and the HK system, but it is a $2200 price difference. The Alpine stereo standard in the Laramie is pretty good ($595 option on Big Horn), some think better than the HK system. You can get navigation for $795, or if you want the 12" screen including navigation for $2095.
A Limited gets you nicer (real) leather, more padded/comfortable seats, more upscale interior (just only use leather cleaner/conditioner on the dash, not armor-all type products), power running boards, spray-in bed liner, LED projector headlights, IMO a better looking grille, and the 12" with navigation standard.
Also, if you get eTorque in a crew cab you get a 23 gallon tank unless you upgrade to the 33 gallon for $445. I think you can get 26 gallon for free but you need to select the box when ordering, and is only available with the Level 2 Big Horn or Level B Laramie packages also selected.
A Big Horn how I would have wanted it was $57k+ MSRP. A Laramie how I wanted it (not including blind spot) would have been just over $60k MSRP. The Limited I have on order is MSRP $62,985. Big Horns don't have much for rebates right now compared to a normal market so only about a $7-8k difference between Big Horn and Limited.