Why is XLR important to you? You running long ICs?
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If you absolutely need XLR consider the Warpspeed, that is what I use for XLR. it will be adequate for your needs but in comparison I do not think it is better than the Lightspeed. Another option would be to find one of the Reference Line passive preamps with the balanced inputs/outputs. Same with the Bent TAP. Although the Bent will run you significantly more to purchase.
You could also consider Goldpoint attenuators. They use high precision 50 ppm 0.1% resistors and have balanced as well as single ended products.
If you want a special curve or ladder network, contact Arn Rotecap (he's the owner) and he might build something to your specs.