im assuming this "oversized card" you speak of is a graphics card, right?
i can't really tell for sure on the first mobo you linked, the p6x58d. if the card is too large, it could block the front panel connections on the lower-right of the board.
if it turns out it won't work with that board, another alternative to your second choice of the deluxe v2 could be this evga
Newegg.com - EVGA E758-TR 3-Way SLI (x16/x16/x8) LGA 1366 Intel X58 ATX Intel Motherboard - Intel Motherboards
you could use the top pcie x16 slot for the gfx card, the 2 pci slots would still be clear for use, and you can use either of the remaining pcie x16 slots for your pcie x1 card, since you can use pcie x1 cards in x4 and x16 slots.