If in fact you will be going during summer all the time, then be aware of the following at WDW: Summer is a low to moderate
DVC demand time and much is available at 7 months out. For near park resorts, VWL, BLT lake view, and BWV pool/garden view are invariably open during that time at 7 months out, including during the July 4 holiday time. Even BLT theme park view and BCV are usually open except potentially for the holiday time and special weekends like Star Wars weekends. AKV standard and savanna view, OKW and SSR are also invariably open. Also VGF 1BRs and 2BRs should be open. (Poly has no history to determine the issue but I am guessing its studios will be open 7 months out during the summer.)
What are far less likely to be open at 7 months out are AKV value and club level, BWV boardwalk and standard view, BLT standard view and VGF studios. If you want any of those regularly, you need to own at the resort to get the 11 month booking window. Moreover, if you have any plans of regularly going any time between late Sep and marathon weekend in Jan (DVCs high to extremely high demand season at WDW) and want anything regularly at a near park resort, you better own at that resort.
Note that patterns could change in the future particularly if Disney does something to make them change, like create some all new, lenghty very popular special event in the summer, or do a point shift that raises the points needed in the Fall months and lowers them in summer. Point increases and decreases for any time periods or rooms are allowed as long as total points applicable to the resort do not change, i.e., any increase for a time period or rooms needs to be offset by an equal decrease for other times or rooms. Nevertheless, summer has been a low to moderate DVC demand time for many years.
The choice of use year does not determine when you can go (which is any time of year) or when you can reserve (always 11 months out at home resort and 7 at others). However, there are better use years than others depending on when you do go. If summer, June to Aug, will be your usual time, then ideal use years are June, followed by April (there is no May use year), followed by March. It has nothing to do with when you can go but use year determines by when you must bank points into the next year if you are not going to use them during the current use year. You can bank up to all of your points on or before the end of your eighth month of your use year. Thus, it is not considered good to have a use year that ends soon after you usually go because if you have to cancel, like a couple months out, you could be beyond your banking deadline and thus lose the use of your points because you are unable to go before the end of the use year. Thus, a use year that begins shortly before you usually go is considered ideal, because if you have to cancel you will still have a long time to bank them or even use them in same use year.
If choosing among purchasing at VWL, AKV or SSR, then one factor you should consider that has not already been mentioned is end date. DVC at VWL ends January 2042, SSR 2054, and AKV 2057. When that time comes, unless Disney has offered to sell you an extension, your ownership at the resort and all DVC rights will be over completely.
Also there is a comment above that AKV is likely to have large future dues increases because of animal care. AKV has higher dues than many others and there is an animal care charge. However, increases it has seen in the last several years have not been due to animal care but mainly due to other categories of dues that other resorts have. One area where it has increased more is actually property taxes. All the DVC resorts are in Orange County. However, part of AKV is also in Osceola County, which has higher tax rates than Orange and for this year had a rather significant increase. In other words, it is not the giraffes that are causing seemingly significant increases but instead the hyenas voted into office.
Bill
I just wanted to see if I did summer months and wanted to stay somewheres else besides my home resort what month I should buy since it would be a 7mth instead of the 11mth. Our happiness at any resorts is fine just to be in Disney makes it 
