PCI vs PCIe to SATA cards

So I've now run out of Mainboard-side SATAII Ports (6 Bays and 6 Ports full).

I want to keep those 3.5 Drive bays full for storage (eventually working up to 1TBX2 RAID0 + 4X2TB Simple Volumes) But relocate my OS to a SSD and another pair of small laptop RAID0 7200 drives elsewhere in my case.

My issue is this:

I've been looking at PCI/PCIe to SATA controller cards to increase my SATA port capacity, but I have no idea what the differences I am going to notice between using a PCI and a PCI"e" port for the controller. What I DO know right now is that the PCIe cards are significantly more expensive per-port than the PCI cards. I also know in general technical terms that PCI-Express outperforms PCI in terms of bus-rate etc..

I guess then the short of it is that I'm concerned about my Read/Write rates and want to know if I'll notice any significant degradation (actually none at all is desired obviously) in transfer rates in relation to either card. Does the difference between PCI and PCIe translate at all to HDD/SSD/RAID0 transfer rates? I'm happy if I can get 200+Mb/s on my two RAID0s and SSD using a PCI card.

Also, I am looking to run one RAID0 array with 2 drives off whatever controller I get, hardware or otherwise.

Examples:

PCI:

http://www.amazon.com/Vantec-6-Port-SATA-Host-Card/dp/B...

The form-factor of this following one would be ideal for me:

http://www.amazon.com/Neewer-Serial-Adapter-SIL3114-Cab...

Now PCIe:

http://www.amazon.com/Syba-Express-Ports-Controller-SY-...

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Obviously the ones above is quite a lot more for the same amount of ports, than the PCI one.

Can anyone shed some light on this?