Do you have a P2 that can support you for the personal plat? That might figure into the calculations too. Though personally, I wouldn't take the 60k offer. In additional to incognito, you can try different browers, different computers, with VPN, with VPN while logged into a remote computer (that was the one that worked for me).
Is there anything on Microsoft you might want? You can use the Dell credit to buy Microsoft GC and bank the credits that way.
The personal plat will take up a 5/24 slot, is that a concern?
The biz plat has 1.5 MRs for purchases over $5000. So if the spend you have in mind is over that, would make a small difference too.