Newbie posting here but been using a Scope system for a while now.

I'm not really into building a PC as I don't have the know how or confidence but might need a new home for my Luna II and Pulsar XTC cards. Can anyone recommend a ready built system that can run both cards without any problem and also have enough free space inside to house the Pulsar XTC which is pretty long by PCI standards?
I have an old PC that would run them but unfortunately the Pulsar XTC won't fit in but if I get something more up to date then I can maybe have everything running off the one system. Then I'd need another PCI slot for my UAD card.
Thanks in advance for your help,
Craig