Can you suggest a good equipment for mining my budget is $3000. I want to mine alt coins.
I'd suggest you check out CryptoBadger's guide to building a litecoin mining rig. He has a pretty good guide to getting a rig going.
http://www.cryptobadger.com/Also, if you are already familiar with using Bitcoin, I'd suggest buying components from BitcoinStore as their prices beat most competitors and you'd be directly support the Bitcoin economy.
http://bitcoinstore.com/Welcome to the forum!