A great combination of machines at the price level. The 833T the Z axis drive is a big plus and the X axis drive if you can swing it. On my last bench top mill I built both drives, mostly because off the shelf drives were not available, the Z axis is a must do in my book. The X axis drive will give very clean consistent finishes and handy for repetitive milling. Get yourself a high quality vise, I recommend a 6" w/o a swivel base to start with. These can hold a much wider piece of stock and with 11" of Y travel would be what I recommend. I recently picked up a second 6" Toolmex when they were a bit less, it is a direct copy of a number of other vises, it is made in Taiwan. Otherwise consider the Kurt DX6, save a bit if you buy direct with one that has a blem, or check online when they go on sale. The investment in an accurate and rigid vise is well worth it.
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On the 1340GT, I would spring for the Aloris QCTP, like a good vise it is something you use all the time. Save your money and buy a bunch of the inexpensive holders sold by QMT, I would not get any of the kits from Aloris OR Dorian. The Dorian QCTP also is very nice, what I used on my previous and current lathe. Their QC as far as surface finish has been a bit variable, but the function of the holder is great. Their holders are another story, they seem to keep changing the dimensions, a real mismatch between the ones I have. Dorian SDN30BXA, the last one I purchased from Zoro with a 20% off coupon is probably similar to the Aloris through QMT. The stock belt on the 1340GT shed rubber all over the place, anything is better. I used the Gates Tri-Power for years and barely showed any wear, others have used link belts. A matter of preference. Going 3 phase with a VFD gives a lot more control. If you go with a VFD, make your machine a single belt speed machine by flipping the motor pulley and using the belt on the larger motor puller to the larger headstock pulley. I believe it takes a BX27 belt, but measure it up as it varies by belt manufacturer.
Only other recommendation is to add a pump oiler for the gearbox to provide more even and consistent lubrication. A number of different ways to do it, but a simple system works well. the key is to get lubrication to all the holes in particular the bearings which are in the far back right corner near the chuck mount.
A DRO for either/both machines (even inexpensive) is a real plus in particular for someone starting out, but also know how to use the machines w/o it. Glass scales are fine, I have installed my own DRO's, good experience and almost always make my own brackets.
A few considerations to look into, QMT sells the Taiwanese Chandox Set-Tru 3J scroll type chuck, might be worth considering. I have the Bison 5C Set-Tru, I use it most of the time, so was worth the investment. A few people have gone Accusize direct mount D1-4 5C, it might be good enough and they seem to be very good as far as returning it if it doesn't meet spec. Alternate is the SHar's ER40 set-tru style chuck.