If it's just for the occasional sampling, you could use a cheap turntable you have laying around at home.
If you're planning on sampling records very much (if you have lots of lots of records and if you maybe want to scratch with it later) it's good to have a decent turntable:
like a Technics SL-1200(MK2), the worldwide DJ-standard.
You can get one second hand for 250-300€, it will keep its value if you ever decide to sell it again.
Cheaper tt's are the socalled OEM-tt's
They all use the same basic components, so on the inside they all look pretty much the same.
Here are a few examples:
Stanton ST/STR8-150
American Audio HTD 4.5
Citronic PD-45/45mk2
Synq XTRM1
Akiyama Acura DJ-4000
Reloop RP6000MK5
Ominitronic DD5250
Kam DDX5000
BST PRO-PR4.5
Koolsound TDJ-04
I have used the sync myself before, and I must say I was pleasantly surprised:
they have a very quick start-stop time (good for sampling)
have a big torque (good for scratching)
are cheaper (good for u'r wallet)
pitch can't beat technics though (only important for mixing)
If' u'r on a tight budget, any TT will do actually but try to mind these things:
direct drive(more stable) = better than belt drive(slower)
higher torque=faster then low torque (start & stop)
as stated a good needle and stylus are the most important things when ripping vinyl to digital
make sure the tt has a standard headshell mount.
2 of the most common needles around are ortofon pro, shure M44-7 or stanton 500, can't really go wrong with one of these