I say go buy a slim. Play it for a couple weeks. Take it to Gamestop and compare screens with a used 1000. If you prefer yours then keep it. If you prefer the 1000 screen then return yours and get the 1000.
It's based on preference. I picked the Vita 1000 due to its quality.
The PS Vita 1000 is the one with OLED screen. Color is much more vivid, and brightness hardly affects battery life, which lasts about 3-5 hours without charging. This is also the model with 3G support. You have to buy your own Memory Stick to download games.
The PS Vita 2000 is a lighter and cheaper version of the original. The 3G support is removed and the OLED screen is replaced with an LCD screen. A significant change in color, and brightness affects battery life a bit more. However, that's backed up with longer battery life, like about 4-6 hours. Also, this model has a 1 GB System Storage, along with an 8 GB Memory Stick, which makes this deal worth it, because they're expensive.
They're both equally powerful, but I believe the buttons should feel different. Again, this is based on preferrence.
And not every accessory for the PS Vita 1000 can be used on the 2000. Just a small precaution before buying.
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Either one is a good choice. Games look more saturated on the 1000 and look more realistic on the 2000. If you prefer the colors of the 1000 turning up the brightness on the 2000 alleviates this a bit. Either way it will still have a much longer battery life. Just jump for either one. You can't really go wrong here.
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I personally feel that the OLED screen of the 1000 is what really gives the Vita its standout feature over other devices.
I dread the day if ever my 1000 dies on me and I have to settle for the LCD of the 2000. If they don't bring back OLED with the inevitable 3000 then I imagine how much people will be selling the 1000 for online...