Another lens to match these ones?

24 f1.4 looks great on aps-c great for indoor & outdoor. The 18-55 IS lens is very good, I have owned the 17-55IS & 10-22, I prefer primes now.

I would keep the 50 f1.8 or upgrade to the 50 1.4.

I would get the 24 f1.4 for environmental portraits.

I would sell all other lenses except the 18-55IS &/or upgrade to 18-200IS

The zoom would suit general use from family outings to sports field shots.

The 50 f1.4 would make the perfect portrait lens

The 24 f1.4 is the perfect group shot lens & interior portraits along with the 50 f1.4 on aps-c & will take awesome landscapes.

the 10-22 is suited to architecture but I don't like that wide for landscape it always looks weird.

The 17-55IS is a boring lens with out the ability to shoot short depth of field is heavy. Good for a pro though.