with upto £200 spending your options are great,
dont go buying something like that link you posted though .
its Dual-WAN ,which can be good if you have two ISP accounts and modems ,setting it in bandwidth aggregation mode would get you almost double speeds... but it looks like a very old model, also its not suitable for home user cable needs, and its got lots of options that are almost useless for the home user today.
as iv been saying for a long time now here, what matters most is what CPU speed you have inside your router, the 3rd party firmwares can also help you get better thoughput, as can turning off the security options and moving this security elswere in the lan.
for easyer options and almost garantee a better CPU inside, able to move/provide far more data throughput, what you want to look for is a 1gigabit router,or one of the current 11N wireless routers (not the old pre-N type) that has at least a 4 LAN switch inside, many are 1gigabit/s WAN/LAN but there are cheaper 10/100 Mbit/s WAN/LAN models for around £60.
as you say, you can ignore the wireless (11n)side if you so wish, and just use it as a wired WAN/LAN router.