Hi Vinod,
Depends on what Nakamichi is available. A 20 year old Nak may be a bad idea but the DR series is available used internationally for 10/12 K is a good option.Naks are built well and last long and spares for the latter series are still available.
U could also look at used technics decks.
If buying new i guess the options are onkyo,Marantz, and Yamaha. If i remember right there is a Yamaha 580se which was a good vfm deck.
If u just want to own a peice of history then a Nakamichi but if its a plain jane decent tape deck u need then a simple two head deck from any of the above brands will be a better option.
I own a Nak DR 10 and its great but i am aware of the problems i will have if it breaks down.
Regards