School is over for me now and university will start in about 2 months. (so I won't use it till then)

I want to upgrade to the SP4 when it comes out. I now need to make the decision whether or not I'm selling my SP3 i3.

Pros:

• maybe higher selling price, because successor wasn't announced yet

Cons:

• I might sell it and then I'm without a device in 2 months (when SP4 wasn't released till then) -> I'd need to buy a used SP3 for university

• The SP4 might include LTE and other goodies the euro/dollar exchange isn't in my favor -> SP4 way more expensive?

• If SP4 price is higher and depending on the improvements, a used SP3 might not experience a big value loss

As a background:

I bought my SP3 i3 on release date for 652€ 94€ Type Cover 35€ Incipio Case 20€ Glass protector 10€ transparent back protector = 811€.

I just got a refurbished SP3 i3, because my old one was broken. Also got a new Glass protector because of the exchange. Basically I have this right now: http://i.imgur.com/PSwqNnO.jpg

I could probably sell everything together for ~730€.

What would you do in my situation? Sell or keep?