im 5ft 8 I sent a message back asking how tall he was just to get a rough idea I was going to ask about the group set but I think it would be a bit of a hassle
Right well I can tell you a few things...should be ok for your height, more important your inside leg. I have a 33" leg and rode a 19" frame. As for the bike its a Rock Springs which is the lower end of the "All Mountain" range of which there are 3 model the Rock Springs, Wolf Ridge and the Attack Trail (in that order of spec). They are slightly heavier than the XC range which goes, East Peak, Rift Zone and Mount Vision (and in also Alpine Trail). This one is a 1999 model and comes with a Shimano STX groupset, looks like Mavic rims and Hope disc brakes so not a bad set up which could always be upgraded. The bi question is the forks and rear shock, if they are shot then that could be costly to rectify. Is it near you? Can you go have a look?
Here are a few that I would consider if I were you...http://www.ebay.co.uk/itm/MARIN-RIFT-ZO ... 4acaf00019http://www.ebay.co.uk/itm/Marin-Alpine- ... 53ff7dcd65http://www.ebay.co.uk/itm/Marin-Rift-Zo ... 33866bf626
You may be able to get something newer but I recon these would go for the £150-£175 mark, giving you some dosh for fixing anything thats knackered or that you might want to upgrade. But just keep an eye on ebay and look at completed listings for an idea of what you might pay for one.