Thanks for the info. I found The Mansion in Bogota. Couldn't find anything in Medellin. Flights are expensive as you suggest. Be good to try somewhere completely different. By the sounds of it, hopefully i won't find it too difficult out there if i stick to recommended places. If anything if i stay at nice hotels, all the WGs will be in the hotel bar anyway so i won't have to go far!
Search ISG for details The Mansion in Med (RTFF there). i don't know if there's the same deal in Bogota. In Med you have a hotel owned and run by punters, most rooms are quite luxurious though they're all more or less the same price as you are paying for the facility. Nightclub downstairs that has pre-vetted prossies so you can dance and drink and flirt and choose to keep one for short time or the night (reasonable prices). Swimming pool where a few prossies hang out by day. One of the owners goes downtown for a breakfast shag each day and will take you with him, no charge, for a tour of the casas (this saves a vast amount of time as it orientates you, lets you see a group that are walking distance from each other, introduces you to the places so you know the routines and the prices without prior concerns, and saves you foraging for many taxis or a walk from the station and getting lost in shitville). Mansion is in a very upmarket area of Poblado so you have the best malls, restaurants, coffee bars all within a few minutes walk. (Mansion 2 is a few yards away if Mansion 1 is booked up but you have to walk to Mansion 1 for the facilities and action.) If you are very keen on staying there, book your room before you book your flight, well in advance, or take a chsnce and maybe get a room that's free for a few days, see their website or phone them got booking strategies).
There's also a guy, can't temember his name, maybe Jake, again check ISG, who does a different set up. Not used him but he's well-respected. He basically sets you up with a pre-screened prossie for the evening and the night, maybe one who speaks a bit of English, and who will sort you out with clubbing, enjoyable nightlife scene and stay with you the night for shagging. (Try and find that on your own as a foreigner with no fluent Spanish, no shit-hot salsa, and no Brad Pitt looks and you could look a long time).