At this moment, Steam has a sale going on right not, both Oblivion: GOTY and Oblivion: GOTY Deluxe edition are on sale for $5 and $6.25! I bought the GOTY edition by accident but it doesn't really matter :b
I'm fine with the normal without all the extra DLCs.
I've been playing Oblivion for the past three-ish days now (non-steam and steam). It's really quite fun. If you're reading this before the 17th of November, you should definitely get one of those, it's really a great deal.
Brillfur, the Khajiit shall prevail!