Do I or don't I?

I want a laptop to take home so I can do some stuff over Xmas.
Now, do I buy a cheap second hand one which would be enough for what I need it for (i.e. text processing and a bit of Internet) or do I get the offer I saw at ALDI (1 GHz PIII, 256MB, 20GB HD, DVD with TV out etc) for 900 quid? This would be ideal for taking off photos from my camera when I'm not home, watch DVDs (which would mean I could start buying some as I don't have a player which in turn would mean spending more money than I really want to).
I could afford the second one now by touching my savings and paying back in from my current account in the new year but I don't know if I really want to. On the other hand, I really want to treat myself for Xmas again. Hmmmm. Decisions, decisions.

Updated Discworld cast

Rincewind - Robin
Cpt Carrot - Jason Sims, Jon Argles
The Patrician, Ridcully - Dave Wade
Granny Weatherwax - Michele Minett
Nanny Ogg - Kath Minchin
Ponder Stibbons - Ozzy (played him twice at DW freeforms at GenCon)
The Librarian - Simon Francis
Casanunda - Mouse, Marc Torley
Leonard da Quirm - Andy D (if he's not a Nocker, nobody is)
Angua - Erin or Isi
Cmdr. Vimes - Dave Thompson, Rich Marsh
Eric - Jason Walter
Susan Sto Helit - Steph, Sue
Hogfather - Rikk
Imp-y-celyn - Jason W
Pteppic - Keyvan
Magrat Garlick - Christi
Colin Boyle - Bursar
Agnes Nitt - Lucy
Greebo - Grim
C.M.O.T. Dibbler - Mongoose
Mort - Keef
Conina - Krys