Moved to Off Topic
Our site focuses primarily on clamshell-style handheld devices with keyboards, the Windows CE versions of which are given by Microsoft the designation of Handheld PCs as a separate category from Pocket PCs like the iPAQ. I trust at least a few of our fellow members, however, will be happy to offer any suggestions they have.
Speaking for myself, nowadays I generally look to eBay to find CF cards for either storage or WiFi. I'm not aware of an iPAQ model that can accommodate the larger PCMCIA cards, though adapters allowing connection between PCMCIA cards and CF slots do exist
(I know because I bought one once
). Again, I'd look for those on eBay.