Genestealer Cults have always interested me since I first read about them in 2nd edition. I have one of the old Patriarch's around here somewhere.
I was pretty interested in Overkill when it came out but it was one project, and then three projects, away from where I was, so I put off getting it.
Then SW:A came out and, much more so than Orks, they are the perfect xenos antagonist for a game like that. So, much like you now, I had to have a box. So I walked to the local game shop the week I got the SW:A boxed set and bought a box of hybrids. Then when we played out campaign game at the store in Pittsburgh I bought the DW:OK game.
I'm not hugely interested in them as a big army of any sort but they are a brilliant narrative army to play in all kinds of scenarios.
I'm glad I was able to tempt you. Enjoy.