Mobile APN - What RADIUS server would you choose?

I've currently got 2 x mobile APNs for VodafoneUK. Both of these are held together via ancient Cisco ACS boxes.

As you can probably appreciate, these boxes need to be cast into the fires of the deep, before they release the magic smoke without external assistance.

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Could anyone suggest a viable RADIUS server to replace ACS with? I've tried to justify ISE, but both pricing and complexity make it a hard sell.

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I need to be able to service

• users of the APN with a Framed-IP-Address
• the administrators with a 'who has authenticated reports', 'show me the authentication report for $USER'
• and not much more.

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I'm not averse to FreeRADIUS, but for the sake of my sanity, would prefer the UI to be a webpage, not a Terminal job.

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TIA