I think the images I am seeing on-line from the new Tamron 24-70 VC and the new Tamron 70-200mm f/2.8 VC lens look quite, quite high-grade and "modern" in their color saturation and really sharp-sharp rendering characteristics. As far as other lenses, the new 85mm f/1.8 AF-S G-series Nikon prime lens is super-sharp, and I mean one of the sharpest, crispest lenses under $4,000. It's only got the one length though...that's the rub. No zoom, so less flexibility than a zoom.
I think the new 70-200 f/4 VR-Nikon, the smaller, lighter, f/4 model is a great value. For light duty use, I expect a 70-200 2.8 or f4 lens from any of the makers will last 20 to 30 years. And it is a SUPER-convenient tool, so, the price while not low, represents five to six different lens lengths in one, single tube, and a heck of a lot of good shootin'!
The lens I have now switched to for portraits is the Nikon late 1990's era 80-200 f/2.8 AF-S. This is not the cheaper "two-ring" model still available new. This lens has three focus-lock buttons, located PERFECTLY for horizontals or verticals, in raised "beds"...small, round buttons you can hold in and use to lock focus with the left hand's thumb or fingers, with the focusing action left on the shutter button: this makes this lens perfect for focus-recompose action on big cameras that have only the AF-ON button when the built-in vertical grip is being used for talls. These focus lock buttons again are perfectly positioned, and they work splendidly, and the left hand can support the lens with the tripod foot. That makes the 80-200 f/2.8 AF-S (the one with the five ED-glass elements!) also a very nice lens for small-body cameras like the D3000 or D5000 or Fuji S5 Pro/Nikon D200 size cameras. it also has GOOD image quality on full-frame, better than the 70-200 VR-1 it has replaced for me on FF. Price wise it's $900-$950, and a bargain at that price. The focus lock buttons on the VR-1 are wayyyyyyyyyy out at the end of the barrel, in frankly, a stupid location; this 80-200, AF-S focusing f/2.8 Nikon zoom lens was designed for SHOOTERS!!!!