If you're going that route, my recommendation would be 15 cleric 4 fighter 1 paladin. Don't underestimate the power of Holy Avenger. Also, if you take paladin as your last level you can max out taunt and have a nice taunter build.
Domains you take depend on your strategy, and whether you go str fighter or dexer. I would recommend choosing from the following:
War Domain: The domain power itself is a fairly nice buff, although a bit short-lived if you have low charisma, spells accessed through domain are of questionable benefit.
Strength Domain: This will allow you to take Divine Power spell at a lower level (3 instead of 4). Can be helpful if you need a different balance of spells (ie need more slots in level 4). As the war domain, the actual domain powers are of questionable benefit, but may be useful.
Trickery Domain: Can be very useful, this domain gives you access to a very nice spell, Improved Invisibility. If you go the Strength fighter route this can add to your ability to avoid hits and supplement your low ac, if you go dexer it can make you close to untouchable.
Magic Domain: Gives access to Icestorm, a very useful spell, although if you're going for a melee build this may not be the best choice. Can still be useful to fall back on.
Protection Domain: If you go dexer I would highly recommend taking this domain. It allows access to two spells you will find highly useful: Minor Globe of Invulnerability (prevents level 3 or lower spells from affecting you, ie balagarns horn), and Energy Buffer (nice elemental damage resist buff).
Whatever you choose to use will be dependant on what build you wish to create, and what tactics you want to use. Those are the domains I would recommend though.
