Around the £200 to £250 mark at a guess? The Top Tech range are literally flawless in terms of performance and reliability. They also have blowback which is nice. One bad thing is the hideous trade marks (if it's a model that has any, my MP5 thankfully doesn't), so if that's something that bothers him, steer clear.
Although they're very specific when it comes to add-ons, I'd say to go ICS - I love ICS so much <3
My old site used ICS M4s as hire guns, plastic version with the full stock - They've been going for YEARS with only basic maintenance, must have all had significantly more than 500,000 rounds through them (around 3000 every weekend for as long as the site's been open... which is easily over 5 years) and the only issue with any of them is that the anti-reversal latch is worn out and very few of them can fire semi-auto. Internal parts are of high quality, they look great, replacement parts are easy to get hold of and there are a number of configurations to choose from.
My ICS L85 is also amazing, even before upgrades.
Other than ICS, there's G&P which everyone raves about, though I'd take all that with a pinch of salt.
I'd say they were the best 3 options. Though I think the ICS is the most expensive - around £280 for a bog standard A1, around £310 if you want RIS, for the metal versions anyway. Plastic ones are considerably cheaper with the same performance.
