A couple of suggestions from me.
Ibis Styles, just off Ingram Street and a five minute walk from Central & Queen St. Brand new hotel, only been open about four months and is very nice. As someone said the Ibis beds are probably the best in the business at the moment. If you go to
www.accorhotels.com and click on the offers tab there are some decent early booking offers at the moment. I stayed in it before Christmas and it was £45 for the room and comes with free continental breakfast.
Travelodge - A brand new one is about to open on Queen Street
Premier Inn - Argyle street, two mins from Central or George Street.
Hotel Indigo - Waterloo Street. Out the Hope St entrance to Central and it's a two minute walk. This is probably my favourite hotel in Glasgow TBH. The rooms are very comfortable and there is complementary soft drinks and snacks in the room, occasionally they also put beer in the mini bar as well and it's free.
Hilton - Five minute walk further up the street from Hotel Indigo. I actually stayed there last week and it was ok but if I had been paying for it myself I would have been disappointed. Hilton have a winter sale on just now though so you might be able to get a bargain.
Radisson Blu - just along from the Premier Inn on Argyle Street. It's a very nice hotel but there is better value to be had in Glasgow than here TBH.
If I had to pick one myself it would be the Ibis Styles or Hotel Indigo.