sairafi,
I've not heard the 2000's, but I do like my AKG 271s which is now the 272. The AKGs have become my second favourite set of cans (my top choice is a rather different sounding can, the Grado 325i). I probably listen to the AKG 271s the most as I like the way they sound--really accurate, great mids, lean but accurate bass, decent highs. They sound better with velour ear cushions (better bass) and are also more comfortable. I think that for 200 bucks you can't go wrong with the AKG 272. If you are into thumping bass avoid them. If you like jazz, classical, pop, folk, rock, country--they are very good. If you are into bass heavy stuff, maybe you would want to look elsewhere.
If my Sennheiser HD-595's disappeared, I'd not replace them.
If my Koss Pro 4AA disappeaered, I'd rejoice (got 'em 35 years ago and just can't part with them).
If my AKG 271s disappeared, I'd look for a nos pair of AKG 271s or buy a pair of the 272's.
If any of my Grados disappeared, I'd replace them (although I might move up the Grado food chain to the RS-2's or RS-1's).
The AKG 271s do benefit from a headphone amp.
So maybe the 272's and a headphone amp?
Cheers!