If you want posh NIT colleges, then you can look for new NITs, because they are developed now and so are well planned compared to old NITs. For Example, NIT Hamirpur has a very beautiful campus and one of the best in India. But, today even old NITs are focussing on infrastructure. NIT Nagpur has many projects going on in campus like new hostels, administative building etc. Same for NIT Warangal.