Yes 1000 Kr will hardly provide you with anything decent in Prague nowadays .. espec now in the higher season

Few nightlife spots:

Mish Mash - THE disco in Prague, at Letna, not too known to tourists, 3 dancefloors, always fun and crowded, affordable prices

Zlaty Strom - near Charles Bridge - a touristy disco on multiple levels however
also a favourite of many locals because of their go-go dancers

Cafe Cafe and k.u. bar - rytirska street - the place to see and to be seen

Celnice Disco - upscale place next to Marriott hotel with themed parties

Avoid: Duplex - the most touristy disco in Prague, Darling Cabaret - most ripoff
place in Prague, Mecca - 'out'

U Prince Restaurant Staromestske namesti - check their great rooftop terrace

enjoy prague