Firewire express/34 cards on Mabook Pro?

I recently needed to add some firewire ports to my Macbook Pro, so decided to purchase a Sonnet firewire express card. It's the one with 2 Firewire 400 ports and one USB port. The card works fine, although I have a big problem with it, basically it is VERY easy for the card to be ejected by mistake, even if you nudge it very slightly. I saw a review of this card which said the same thing, but I'm wondering if this is the same for all express cards, or just this one?? If they are all the same, is there some other way to secure it so there's no chance of it pinging out? If this is meant to be a new "standard" I find it very difficult to believe the connection would be so delicate...

I also realised that I actually need a card with FW 400 and 800 ports, or a card with 2 FW 800 ports. This is because I need to connect 2 audio interfaces, it's not worth going into the details but it's a very particular setup, and they need to be on the same bus. So I CAN'T use one 400 port on the express card and then use the normal FW800 port of the Macbook Pro (the devices also cannot be daisy chained, and even if they could it would slow the 800 device down to 400, which wouldn't be acceptable).

I noticed there are three or four such cards available, including one from Sonnet. I really want to avoid Sonnet if possible, because of the loose connection issue. I also need to know, if there is a FW400 and a FW800 device connected to an express card, does the speed of the 800 device slow down to 400, or can one run at 800 and the other at 400 simultaneously??

Thanks in advance.