Yeah you need to spend another £10 on the more expensive intel board to get your USB 3.0 and SATA 6 on the intel build. Having said that it's quite likely they will be of no use to you unless you get a blisteringly fast SSD and some USB 3 devices in the next few years, so you could just not worry about it.
Personally I'd take the intel build any day over the AMD in this instance. Have a look at these benches...
http://www.anandtech.com/bench/Product/120?vs=118
555 is getting thrashed in most instances by the i3. However look at games and it's much closer with the two CPUs trading blows. Bear in mind a couple of points:
1. Those are at stock speeds. The 555 will realistically OC about 25% (3.2 to 4GHz), but the i3 will realistically OC about 50% (2.93 - 4.4 GHz). Notice there are no AMD OC'd bundles above 4GHz.
2. Games are generally GPU bottlenecked with these modern CPUs. But as they become more CPU intensive and start to use more than 2 threads, gaming results might start to look more like all those other results on those benches, as the i3 with hyperthreading pulls ahead.
Therefore imho the intel build is the one to go for now.