I have a Stack-On unit that I really like. Bolted to the floor and wall bracings, makes it very difficult to get broken into. Also wired to the alarm system.Hard to say till you say what you need. A basic safe - no fire protection will keep children and casual thieves out of your guns, hard to beat the Rural King $90 to $120 Stackon units. A little nicer Stackon - carpeted, with digital combo lock and pretty thief proof (still no fire protection) runs about $350. From there you can spend what you want, $5.000 - $!0,000 for a heavy safe that has good fire protection and excellent locks.
How much are you willing to spend?
You can find gun safes from $300 to $5000 and up.