I would recommend crank brothers pumps with gauges or something like the road morph. I had a completely cheapo pump that didn't work at all. I bought a blackburn pump for about the price range you're talking about it and yes, it actually pumps the tyres up and locks on properly. I thought this was quite good at the time until I got a major puncture and realised that sadly it too is practically useless. You have a puncture and break down 5-10 miles from home, you can get up to 20psi and slug home faster than you can walk (just). I got a crank brothers pump with a gauge on it and had to fix one punctures miles out in the middle of nowhere in the Peak district completely on my own. A piece of cake in comparison. Also helped change tubes for someone else on the road once and the turnaround time was very, very quick - this from someone who is inept at changing tubes. I think gauges are very useful as it's hard to tell the difference between about 20psi, 40psi and certainly anything above that. Some people manage. If you have Popeye arms and can gauge pressures by feel accurately you'll be fine with a blackburn pump.