I don't think that the fact you are in a contract with U.TV should have any bearing on your decision to get a wireless router from them (only that it's suitable for their product/service), I'm sure any suitable router will be fine, and you may be able to get it cheaper than €95.
WRT to speeds, I'm not much of a tecchie, but I think the speeds might be affected marginally (if using one connection) and a bit more of using multiple connections. Note that I think the download speed will be the same, but the speed at which the data is transferred to your pc (from the router) is governed by the spec of the router and the receiving device (e.g. a network card-p.s. I presume that you have a wireless enabled pc or laptop?? I don't unfortunately, but the card isn't that expensive-€30 or so I think).
I'm sure there are better informed people out there than me though????