I doubt if O2 intend to do landline packages. If they do I hope it will be WLR and calls only, as full LLU is a big turn-off for many of us. Post Office landline is a good deal, if the free BT installation offer has finished. Obviously avoid Post Office broadband for your needs.
Contrary to the previous poster's opinion I think your downloads would be fine. In any case what alternatives have you at similar prices?
Have you checked either with the existing owner of the new house what speeds are likely to be like? Attenuation is the main factor.
The reason I ask is that Pro obtains the higher upload speed by taking the lowest download frequencies and using those for upload. So two factors need to be considered.
First is that unless you are next door to the exchange you will probably lose 2-3Mbps of connection speed on Pro, (assuming you stay on Annex M and aren't choosing Pro just for the other extra little bits), and second if the connection speed is likely to be below 16Mbps then you are unlikely to get above the Annex A 1.3Mbps upload anyway, though I suppose you would get more than an Annex A connection.