Okay, I'll give you a reasonable answer!
It depends a lot on your budget. The other day; I saw a Suzuki GS500F at around 250,000 Rupees. Now, it's not exactly a sports bike, but it does resemble one:
Alternatively, you can look for old late 1980s and early-mid 1990 250-400cc 4-Cylinder crotch-rockets like CBR250RR or Honda RVF400 etc. The local market is full of these bikes although spares and maintenance will be quite a pain as these machines are quite old now!
This is The Honda RVF400:

P.S: Notice the exotic single sided swingarm on The RVF. You see these swingarms only on Ducati & MV Agusta sport bikes nowadays! So cool and awfully Classy!
Hence I'd strongly suggest The GS500F which is basically a GS500 albeit with a full fairing.
Then there's Suzuki Katana Series, which are also quite popular in Pakistan and are usually much cheaper than GSX-R aka Gixxers.
Here's The Katana 600:

Although they cost significantly more than GS500s. Anywhere from 300,000 to 500,000 rupees (depending on condition) and as with most HEAVY bikes, spare-parts and maintenance will be a huge headache!
Good Day!