From the looks of it, there are headphone and optical outputs, no RCA. Whoever said that optical out is worse, has no idea what they are talking about. Optical is digital, headphone and RCA out are analogue. Ideally RCA is the best to use, as it's a cleaner signal than the headphone out, as it bypasses the TV's internal amplifier, and optical out requires a DAC (digital to analogue converter) in order to connect a standard set of speakers.
All audio is analogue before it gets to the speakers themselves or headphones, so at some point along the chain digital is converted into analogue. In the case of the headphone output, the TV's built in DAC will do this, as it would do if the TV had RCA. The DAC in the TV will be fine, but it's the built in amplifier the headphone output uses which makes that particular output on a TV, not the best choice. The amplifier in a TV is always poor. RCA output bypasses that, so you get a cleaner analogue signal. As the TV has no RCA, optical out will give you the best signal.
There aren't that many speakers that have a built in DAC, and certainly none for up to and around £60. You're probably looking at £100 minimum, but even then the choice is few, and they aren't going to be that great. Ideally, it would be best to buy a DAC, then connect stereo or 2.1 speakers of choice to that. However, you'd be spending £20-£30 on the DAC alone, leaving very little for the speakers, which are arguably more important. £60 will buy you some nice speakers, but you'd have to use the headphone output on the TV. Although using a DAC to speakers will provide a better signal than using the headphone out, the speakers are important. It would be better to use the headphone out, then to buy a DAC and buy some cheap rubbish speakers to go with it. I think if I were in your position, I would buy a pair of Edifier R1600T for £60 and use the headphone out on the TV, then at a later date buy a DAC. Something like a FiiO D3.
