I have three of the kinda terrible and small metal Genestealers, so that is not really an option. The Overkill 'stealers are by far the best looking of the bunch, but I had only four of those. I do have just shy of a zillion of the other plastic versions. So I did a lineup to compare and contrast.
The Overkill version is on a 32mm base, which works well for the whole big arms thing 'stealers do. I put the 5th edition one on a spare Blood Bowl slotta base which is 32mm. Then I tossed in a 'stealer from my old Space Hulk set.
The Overkill Genestealers are a bit hard to come by. I traded for a few, and won a couple of auctions on eBay to bring my total up to ten. I decided to use ten of the older Space Hulk minis to fill out my force of twenty. Oh yes, this little project was getting a bit crazy.
I carefully cut the 25mm bases off and put the old timers on new 32mm bases. Then they got a repaint. I was worried the new coats of paint would pile up and make a blob-like 'stealer, but I managed to thin the paints enough for this not to happen.
Blessed Are the Void Kindred
Don't Question the Starry Wisdom