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£240.00 that's an incredible amount of money to spend.
Firstly your desktops, and probably the laptop will all have an ethernet port. The more stable, fastest connection is achieved by running ethernet cable between a router (which would normally be next to your existing modem) and the computer. Thus that is the cheapest option, if the cable routing is achievable. Certainly for the non portable desktops that can be the best option.
Your laptop, depending on it's age, may well already have a wireless card in it. If it does you won't need a separate adapter for it to go wireless. Even some desktops are supplied with wireless. It's worth checking. You'll only need a wireless adaptor for computers that don't have one already, if you do want them wireless.
A simple wireless cable router (don't get an ADSL one) will allow you to establish both a wired and wireless network. You can then mix and match what you need for your home. Wired networks at 100mbps will be faster than your broadband, so no slowdown there. Make sure the router you get is 10/100 enabled on it's WAN (internet) port. For wireless then the 802.11
g standard at up to 56mbps still exceeds the fastest broadband. As that is the speed any inbuilt wireless in a laptop or desktop would run at, it's all you need. However if buying new wireless adaptors and router stuff consider the "n" standard, although that isn't fully ratified so there might be some odd incompatibilities between different kit manufacturers. Kit that runs at "n" should also support the lesser "g".