If it were myself looking to buy then i'd choose Gigaset too.
What I I don't like about these types of IP phones though is the price! You can buy an ATA and a set of DECT phones for a lot less and should any of the phones break, just throw them away and replace them with any brand in any price range you like. Remember, you still need to plug the base into the mains as well as every handset docking station! Only real installation benefit is that you don't need a BT cable coming from the DECT base going to an ATA...
What exactly is driving you insane obi wise? OBIHAI now only seem interested in Google Voice and monthly/annual subscription services. I now understand why no UK main stream VoIP provider sells/offers them! Their firmware deployment is dreadful with no changelog to boot! I still have an OBi1032 on the shelf covered in dust because it isn't capable of matching an incoming callers CLI to one stored in the phonebook.
For the record, I still use an OBi202 for my home phone line and fax machine and it works a treat.
No doubt you already know this by now... Gigaset do the N300 and N300A base station, both looks like this:
The N300 series doesn't offer POE, supports 3 VoIP + 1 PSTN concurrent calls and allows upto 6 handsets to be registered at any one time. The only difference between the N300 and N300A is that the N300A version has a built in answerphone.
Gigaset also offer the N510 base station which looks like this:
This base station cannot be connected to a PSTN line but does support POE! 4 concurrent VoIP calls can be made on this device and again it allows upto 6 handsets to be registered at any one time.
You can buy these as part of as package or on their own. So if you need the PSTN connection choose a package that comes with either the Gigaset N300 or N300A!
You should also be aware that all the Gigaset single-cell DECT bases and handsets are compatible with each other, but some handsets may only offer basic or limited compatibility! To find out more information check the Gigaset DECT compatibility
chart on the Provu website.