If I was you I would wait and see if the new rMBPs come out on the Oct 15th, which has been rumored quite a bit. Because provided they get released the same day, you'll still be able to use your friends discount.
If they don't come out on the 15th, a current gen rMBP is almost twice as fast as the iMac you currently use to do all your work anyway. The only reason you might want to wait for Haswell is the improved battery life for your long trip.
You're right about the current rMBP being nearly twice as fast as my iMac, I had edited my post recently and included the fact that the NEW Haswell rMBP is not applicable to using his discount as Apple Employees cannot use their discounts on newer MBP's for up to 1-3 months after release. It's very tempting to get the Early 2013 I could have it by this week!
TheVerge tells that at $1499, you get a base model with Core i5, a 1080p screen (1920x1080), integrated 4400HD GPU only, hybrid storage (1TB HDD + 32GB SSD) and a smaller battery.
If I would buy the XPS15, I would surely go for the better screen, 750M dGPU, 256-512GB SSD and the larger battery. But that's probably going to cost somewhere between $2000-2500, meaning it's rMBP price territory.
That is an eye-opener, if this is 100% the case then I have just marked this laptop off of my options list (was already a tad skeptical).
The new release doesn't do much if you can't use the discount anyway.
Is the discount good in the refurbished store? If so you should be able to get a pretty awesome deal! Otherwise buying new with the discount should be good too. Either way you can sell it after the refresh comes out and upgrade. Or keep it.
As far as I've researched you are not allowed to combine employee discount + refurbished prices.
too many HAX lol.
Thanks for your replies. I suppose waiting until the 15th would not hurt(much). The thought of having a rMBP all ready for my trip to Hawaii and NYC is so comforting!