I'm learning in a Grob 115 out of Coventry. The school I'm at has a mixture of C152, C172, a couple of PA28s and an R2160.
I've been up in a C152 a few times but found is too cramped. I would normally expect an instructor to buy me a drink before I sit on his lap...
The Grob for me was a really good balance between cost (only £5 more p/h than the C152) and space (it has a centre console which means plenty of room). The others in the fleet are just too expensive for me.
Also, as a personal preference, I prefer low-wing aircraft.