A Grumman AA5b Tiger will do that readily; a complete aircraft will be around £25k, so £5k should buy you around a 20% share.
The slightly less capable Grumman AA5a Cheetah will be a bit cheaper, but you'll struggle slightly to meet your payload requirements.
I have a Cheetah (share), airways fit (2xVOR, DME, ILS, ADF, single axis autopilot, 2 radios, 2 altimeters, mode-S generally supplemented by my personal GPS), 6 hours endurance with 2PoB, 3 hours endurance with 3PoB [200 litres capacity, burns about 30 litres/hr, but not brilliant payload]. We run it (across the syndicate) at a nominal £20k purchase value, £90/hr, and £800/month divided between us all - and that's operating from a very expensive airport and keeping it on public transport with some training use. You should be able to bring that £800 down a long way on private category, from a small airfield, with named and reasonaby experienced pilots - I'm guessing you can probably halve it: so maybe £80/month each for 5 sensible owners, putting £5k in each to purchase.)
Comparing the two, the AA5b will have about another 150lb payload, but burn around another 5 litres/hr than the AA5a, maybe increasing cruise from ~105kn to ~110 kn.
The one thing an AA1 or AA5 won't give you is anti-icing capability, but nor will pretty much anything else under £100k. (The AA1 is basically a 2 seat AA5 and generally quite a lot cheaper, they're going for around £14k second hand at the moment.)
For what it's worth, with 140hrs at the time on PA28s (okay yes, and about 1000 hours on other things as well), I had a go in the AA5 and took about 90 minutes to be an utter convert. Nicer cockpit, I like the slide-back canopy, lighter control forces, better avionics fit than you normally get in a PA28. If the Autopilot ever worked, it had a yaw trimmer, and it was anti-iced, it'd be perfect. For the money, I think it's the best light tourer I've yet seen.
G