Like Robbie, I have a serious problem with some of the definitions of low end. No way a Centurion Ironman is "Low End".
That said, I have some bikes that I consider low end. Then again, someone riding a Huffy Express would probably consider most of these to be high end or mid-level.
Attached pics, 1978 Motobecane Super Mirage
1984 Schwinn Traveler
Not Shown In Pics:
1986 Schwinn World
1986 Lotus Challenger
1985 Fuji Espree
1986 Peugeot Iseran
Full Pics below: 1987 Nishiki Custom Sport, Someone told me this was a very low end, basic entry level bike. Well, I guess if a full chromoly frame, double butted main tubes, downtube index shifters, 1.8cm clincher rims with duel QRs is your idea of low end, so be it.

I consider this Raleigh Record to fit the description of low end. Still its been a fun bike to own.

This Nishiki Sebring fits the low end description too.

To me, low end is relative. One person's "low end" is someone elses dream bike.