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So I'm thinking of picking up an old Dark Eldar battle force from my FLGS and was curious if you fine gents/ladies would be willing to guide me towards a decent list for about 1500 points.

For clarity the set contains as follows:
10 witches
10 kabalite warriors
3 reavers
1 raider

I'm not too sure where else to go from there or would it be better if I went and got the new start collecting box? (or both?)

Venoms lots and lots of venoms are seen in almost every competitive dark eldar list. Also I've seen so many of their fliers and they seem to perform alright. What the battleforce box comes with that is very helpful is really the kabalites and the raider potentially.

Have a look at the site https://www.40kstats.com/ and the Tactics forum here where you'll find some interesting DE armies.